Read the following passage and questions, then choose the right answer from options, the answer should be one of A, B, C, D.

<passage>:
Extensive research did not uncover any evidence that race an inferiority complex—but then he tried to climb it! "It's more than a legend," said Sam Halden, biologist. The reaction was not unexpected—non-humans tended to dismiss the data as convenient ages before space travel— and yet each planetary race can interbreed with a minimum of ten others ! That's more than a legend—one hell of a invisible or not, didn't improve her appearance any. How could he still "It is impressive," admitted Taphetta. "But I find it mildly lot more!" he's even more savage than I am." "Is he?" She smiled enigmatically. "Maybe, in a biological sense. Too world, there's nothing like your species, except superficially, and that's true of all other creatures, intelligent or not, with the sole exception of mankind. Actually, the four of us here, though it's accidental, very nearly represent the biological spectrum of human advantage?—for the children she intended to have. Outside of that, development. "Emmer, a Neanderthal type and our archeologist, is around the beginning of the scale. I'm from Earth, near the middle, though on the physical, to make use of her body so as to gain an advantage—what much, though. You're just right." unbroken line of evolution that could be traced back a billion years." "You're thinking of Earth," said Halden. "Humans require a certain kind toward the highest goal they could conceive of? Climbing over—no, —everybody they could coerce, seduce or marry—onward and actually a manlike creature there. Naturally our early evolutionists "But there are other worlds in which humans who were there before the Stone Age aren't related to anything else there. We have to conclude that Man didn't originate on any of the planets on which he is now found. Instead, he evolved elsewhere and later was scattered throughout this section of the Milky Way." result of parallel evolution—not when a hundred human races are the human race." about himself." It was easy to understand the attitude. Man was the most numerous though not always the most advanced—Ribboneers had a civilization as high as anything in the known section of the Milky Way, and there were others—and humans were more than a little feared. If they ever got "We've got new data and are able to interpret it better. The theory is systems on which humans existed prior to space travel, we get a certain change was almost imperceptible, but it was enough to indicate that he "To the best of our knowledge," said Kelburn. "And whereas there are "Plus or minus a hundred thousand years, we can still get something that might be the path of a spaceship attempting to cover a mammals, we're able to place the first human fossils chronologically. light-years—then. Now it's far more. And, of course, if it were a fast-moving star, it might be completely out of the field of our exploration. But we're certain we've got a good chance of finding it Halden flushed the sarcasm wasn't necessary. It was true that Kelburn was the most advanced human type present, but while there were differences, biological and in the scale of intelligence, it wasn't as great as once was thought. Anyway, non-humans weren't trained in such as this should cancel out any previous agreements. Still, what are profits from any discoveries we may make." you all day—it's micro-printing. However, you needn't be afraid that I'm defrauding you. It's honored everywhere we go and we go nearly been inexplicably slow in developing and he wasn't completely aware of his place in the human hierarchy. evolution had taken a different course, but that he was in no sense less complex than Man. It was a paradox that some biologically higher humans hadn't developed as much as lower races and actually weren't "Hydroponics is your job. There's nothing fast as they grow." "Insects? There shouldn't be any, but if there are, we've got sprays. Use them." places to hide." He looked up defensively. "This is an old ship with new equipment and they hide under the machinery. There's nothing we can do except rebuild the ship from the hull inward." They couldn't set up a continuous watch and shoot the animals down because there weren't that many men to spare. Besides, the use of weapons in hydroponics would cause more damage to the thing they were typical pest." radiation, or it may have nested near the atomic engines both are possibilities. Either way, it mutated, became a different animal. It's it detects and avoids, even electronic traps." "Then you believe it changed mentally as well as physically, that it's smarter?" "I'd say that, yes. It must be a fairly intelligent creature to be humans. Is there anything else you can tell me about the hypothetical Emmer didn't look like the genius he was—a Neanderthal genius, but Impressive, but just a camp, monolithic one-story structures, and we'd give something to know what they're made of. Presumably my world it, so they built more elaborately than they did later on. One-story structures and that's how we can guess at their size. The doorways were forty feet high." "Nothing," said Emmer. "There were buildings there and that was all, not a scrap of writing or a tool or a single picture. They covered "A faster-than-light drive and an extremely long life," mused Taphetta. they needed in the entire Milky Way. Their science was tremendously advanced and when they learned that, they may have altered their germ plasm and left us, hoping that some of us would survive. Most of us don't have the total capacity that later Man does, and yet we're as advanced in civilization. The difference? It must lie somewhere in the planets we live on and it's hard to say just what it is." "What happened to those who didn't develop space travel?" asked And they had, no matter who or what they were, biologically late or early, in the depths of the bronze age or the threshold of for non-humans, that the race stuck together. They weren't actually discovery of the unknown ancestor?" "Of course," rustled the Ribboneer. "But a lot of money and equipment was required for this expedition. I can't believe that the educational curiosity." "Cultural discoveries," rumbled Emmer. "How did our ancestors live? When a creature is greatly reduced in size, as we are, more than physiology is changed—the pattern of life itself is altered. Things "No doubt," said Taphetta. "An archeologist would be interested in cultural discoveries." "Two hundred thousand years ago, they had an extremely advanced civilization," added Halden. "A faster-than-light drive, and we've achieved that only within the last thousand years." "But I think we have a better one than they did," said the Ribboneer. "There may be things we can learn from them in mechanics or physics, working directly with their germ plasm, they modified themselves and produced us. They "To the individual, they are, but it won't matter if you discover as much as you think you will. The difference is this: That was what Taphetta had been afraid of—there was one kind of technical advancement that multiplied unceasingly. The race that could improve itself through scientific control of its germ plasm had a start like the way your primitive mind works. At times I actually think of marrying you." "Primitive," he said, alternately frozen and thawed, though he knew advanced. "It's almost a curse, isn't it?" She laughed and took the curse away by leaning provocatively against him. "But barbaric lovers are often nice." the difference, he decided. A notch or two up the scale of visual primeval Earth." He said nothing she knew as well as he that Earth was as advanced as "I don't think I will, though. We might have children." "Would it be wrong?" he asked. "I'm as intelligent as you. We wouldn't have subhuman monsters."

<question>:
What is NOT a technological advancement involved in this story?

<options>:
A Rapid healing abilities
B Advanced space travel
C Rapid mutations
D Advanced weaponry

<answer>:

D