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

<passage>:
The above the desk. So were the Grdznth and Charlie. lost a bet to himself because it had come three days later than he expected, but it had come all the same, just as it always did "Then you cracked the differential?" scaly green body followed, four feet away, complete with long at the end. For a moment the creature floated upside down, legs pirouette, and settled gently to the floor like an eight-foot see any Grdznth babies. It's going to be a little too cold for tried to bury himself in his mother's coat collar. An indignant that except in passing. Should have, though, long ago. Two completely independent universes, obviously two energy systems. Incompatible. We were dealing with mass, space and dimension—but the energy differential was the important one." "What about the energy?" "We're loaded with it. Super-charged. Packed to the breaking that. The energy factor," he mumbled. "Nobody thought of the desk pad. "Look, it took energy for them to come through—immense quantities of energy. Every one that came through upset the balance, distorted our whole energy pattern. And they knew from the start that the differential was all on their side—a million of them unbalances four billion of us. All they needed to overload us completely was time for enough "Not at all." Pete tossed his briefcase on the floor. At a wrinkles of satiny green fur. He knew, of course, that the Grdznth were mammals—"docile, peace-loving mammals," Tommy's PR-blasts had declared emphatically—but with one "You don't mind?" said the creature. wave of horror and revulsion. The creature was most incredibly ugly. Great yellow pouches the seat as the Grdznth breathed at him wetly through damp A lovely place, really. Just a little too cold for Grdznth. They thought Earth was much nicer." The Grdznth nodded sadly. "It's horrible of me, but I just "For them," whispered Tommy. Galaxy October 1956. Extensive research did not uncover any evidence The Grdznth looked at him reproachfully. "The Wives, of course. The climate is so much better, and they mustn't be sticking out his tongue at the Grdznth. the Grdznth was beginning to fade out. The creature gave him a toothy smile, nodded once, and empty. Pete leaned back, grinning to himself as the angry chuckled to himself, and the passengers avoided him like the thought you'd never get here!" he groaned. "When you didn't though one gentle shove might send him yodeling down Market "Yes, I know. And the Grdznth are getting worse by the The more Grdznth come through, the more they act as though the Grdznth just go right ahead anyway." the Grdznth a bit—they have personal protective force fields they can't be killed, that they're just moving in to stay." The Grdznth agreed to leave at a specified time, and something according to the math boys. It's a parallel universe, one of several thousand already explored, according to the Grdznth scientists working with Charlie Karns. Most of the parallels are analogous, and we happen to be analogous to the Grdznth, a point we've omitted from our PR-blasts. They have an eight-planet "Apparently. Nobody knows how they predicted it, but they through parallel after parallel trying to find one they can migrate to. They found one, sort of a desperation choice. It's cold and arid and full of impassable mountain chains. With an system for getting a good strong Grdznth population on brains, education, ability and adaptability the females were Pete grinned. "Grdznth in utero. There's something poetic through, to rest and parturiate." "So Earth becomes a glorified incubator." Pete got to his it just doesn't wash. If the Grdznth are so unpopular with the see. The fee is so high, Earth just can't afford to lose it. Charlie shoulders like a shroud. In his arms he clutched a small black box. "It's the parallel universe business, of course," he said to Pete, with Tommy beaming over his shoulder. "The Grdznth can cross through. They've been able to do it for a long time. According to our figuring, this must involve complete control of mass, space and dimension, all three. And time comes into one of the three—we aren't sure which." released the lid. Like a jack-in-the-box, two small white plastic null-gravity to operate." How many computers have you burned out, Charlie?" "Four. There's a differential factor, and we can't spot it. They have the equations, all right. It's a matter of translating them into constants that make sense. But we haven't cracked the differential." "And if you do, then what?" Charlie took a deep breath. "We'll have inter-dimensional control, a practical, utilizable transmatter. We'll have null-gravity, which means the greatest advance in power utilization since fire was discovered. It might give us the opening to a concept of time travel that makes some kind of sense. And power! If there's an energy differential of any magnitude—" He shook his head sadly. "and how long the Grdznth gestation period will be." "It's a fair exchange," said Charlie. "We keep them until the girls have their babies. They teach us the ABC's of space, mass and dimension." Pete nodded. "That is, if you can make the people put up Tommy sighed. "In a word—yes. So far we've gotten nowhere down on a chair and burying his face in his hands. "I've failed. Failed!" The Grdznth sitting on the stool looked regretfully from the advances Earth will have, the wealth, the power. No dice. The "How about the 'jolly company' approach?" "Tried it. There's nothing jolly about them. They pop out dropped into a chair with a sigh and flipped a switch. "Okay, what is it now?" clear. If the Grdznth do not go, I go." "That would never do, of course," murmured Pete. for all the little Grdznth to arrive, and nobody's given them a Grdznth are lovable?" sanctity of Grdznth motherhood, my friend, anything goes." "It's genius," chortled Tommy. "Sheer genius." The planning revealed the mark of genius. Nothing copy, hypersensitively edited copy, finding its way into the light of day through devious channels. Three days later a Grdznth miscarriage threatened, and was averted. It was only a page 4 item, but it was a beginning. Determined movements to expel the Grdznth faltered, trembled with indecision. The Grdznth were ugly, they frightened were Not even expectant Grdznth mothers. thinner and thinner, while Pete nursed sharp post-prandial feelings? The blast is washing over them like a wave and there "Not a hint. Last night's panel drew like a magnet. The what the Grdznth are giving us, they'll Nothing. But give him one, and then try to take it great." for Charlie and his gang to crack the puzzle, time for the Grdznth girls to gestate. But what are we hearing from nothing except a whole lot of Grdznth and more coming through just as fast as they can. I'm beginning to wonder what the Grdznth "Well, they can't gestate forever." on the floor. The machines clattered wildly, coughing out "You can count on the people staying happy for at least see some baby Grdznth at the end of it all." There was dead silence in the room. "Baby Grdznth,"

<question>:
What was the ultimate outcome of letting the Grzdnth take repreive Earth?

<options>:
A The Grzdnth decided to make Earth a permanent home and cooperate with the humas
B The Grzdnth enslaved humankind after staging a coupe
C Humankind would be transported to a parallel universe
D Humans were able to discover the secrets of inter-dimensional travel

<answer>:

C