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

<passage>:
"Remember Junie O'Brien? The little golden-haired girl on Mars, a Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] A hayseed Martian among big-planet slickers ... of course 'What mysterious knowledge did the Old Martians possess? What was only hope. I've been wondering, maybe we could organize a Martian "I'll say you do! With a Martian!" Peri narrowed her silver-blue gaze and looked icily at him. "You must have heard wrong, Gus. He's the heir apparent of Indonesia, Inc., or something. I got this Martian for you, see?" "So? Since when has all Mars had as much spending money as one big-time even a high-level type like you? Listen, I need you just for tonight, see? This Martian is strictly from gone. He is here on official The gravity was not as hard to take as Peter Matheny had expected. Three generations on Mars might lengthen the legs and expand the chest a trifle, but the genes had come from Earth and the organism readjusts. What set him gasping was the air. It weighed like a ton of wool and had apparently sopped up half the Atlantic Ocean. Ears trained to listen through the Martian atmosphere shuddered from the racket conducted by Earth's. The passport official seemed to bellow at him. "Pardon me for asking this. The United Protectorates welcome all visitors to Earth and I assure you, sir, an ordinary five-year visa provokes no questions. But since you came on an official courier boat of your planet, Mr. Matheny, regulations force me to ask your business." "Well—recruiting." Mars, would they?" "Oh, we don't expect immigration," said Matheny shyly. He was a fairly young man, but small, with a dark-thatched, snub-nosed, gray-eyed head that seemed too large for his slender body. "We learned long ago he asked himself in a surge of homesickness. What the hell is the Martian Embassy here for? He, Peter Matheny, was no more than a peaceful professor of , thought Matheny, here I am, one solitary outlander in the greatest commercial empire the human race has ever seen, and I'm supposed to find my planet a con man! but he wasn't tired the spaceport would pneumo his baggage to him whenever he did check in. The few Martians who had been to Earth had gone into ecstasies over the automation which put any service you could Mars had such machines. If ever. The Martian crossed the lobby. His pipe went out in the breeze from an customary form of challenge on Mars. Here, though, they simply pushed "You're from Mars, aren't you?" he asked in the friendliest tone Matheny had yet heard. "Nah. I am not doing one thing in particular. Besides, I have never met a Martian. I am very interested." "There aren't many of us on Earth," agreed Matheny. "Just a small embassy staff and an occasional like me." "I should think you would do a lot of traveling here. The old mother planet and so on." "We can't afford it," said Matheny. "What with gravitation and distance, such voyages are much too expensive for us to make them for pleasure. Not to mention our dollar shortage." As they entered the shaft, he added wistfully: "You Earth people have that kind of money, at least in your more prosperous brackets. Why don't you send a few tourists to us?" made a million years ago by a, uh, extinct race ... I tell you, she "Trouble with it is, I hear Mars is not so comfortable," said Doran. "I "I do know," said Matheny. "But we're poor—a handful of people trying to make a world of dust and sand and scrub thorn into fields and woods and seas. We can't do it without substantial help from Earth, equipment and supplies—which can only be paid for in Earth dollars—and we can't export enough to Earth to earn those dollars." Matheny shuddered. "Good Lord, no!" "Huh? But they make thyle right on Mars, don't they?" "Yes. And it all goes to Earth and sells at 2000 dollars a fifth. But you don't think we'd why do you call yourselves poor?" "Because we are," said Matheny. "By the time the shipping costs have been paid on a bottle, and the Earth wholesaler and jobber and sales engineer and so on, down to the retailer, have taken their percentage, Earth taxes—there's very little profit going back to the distillery on Mars. The same principle is what's strangling us on everything. Old Martian artifacts aren't really rare, for instance, but freight charges and the middlemen here put them out of the mass market." so on to people who like to act cosmopolitan, and I understand our travel posters are quite popular as wall decoration. But all that has to be printed on Earth, and the printer and distributor keep most of I Was a Slave Girl on Mars know, the title deeds to one square inch of Mars—but expressed Martian stamps are a drug on the market. What we'd like to operate is a Doran whistled. "I got to give your people credit for enterprise, anyway!" He fingered his mustache. "Uh, pardon me, but have you tried to, well, attract capital from Earth?" "Of course," said Matheny bitterly. "We offer the most liberal concessions in the Solar System. Any little mining company or transport dollars in Mars—why, we'd probably give him the President's daughter as security. No, the Minister of Ecology has a better-looking one. But who's interested? We haven't a thing that Earth hasn't got more of. We're only the descendants of a few scientists, a few political malcontents, oddballs who happen to prefer elbow room and a bill of hope to get from Mars?" "The only beer on Mars comes forty million miles, with interplanetary Martian. then?" "Yes. I told you we haven't any tourists. I was sent to hire a business manager for the Martian export trade." "What's wrong with your own people? I mean, Pete, it is not your fault there are so many rackets—uh, taxes—and middlemen and agencies and et cetera. That is just the way Earth is set up these days." Matheny's finger stabbed in the general direction of Doran's pajama top. "Exactly. And who set it up that way? Earthmen. We Martians are babes in the desert. What chance do we have to earn dollars on the scale we need them, in competition with corporations which could buy Earthman himself. Let him tell us what will appeal to your people, and how to dodge the tax bite and—and—well, you see how it goes, that sort of, uh, thing." Earth years, mind you." "I'm sorry to tell you this, Pete," said Doran, "but while that is not bad money, it is not what a high-powered sales scientist gets in Newer York. Plus his retirement benefits, which he would lose if he quit where he is now at. And I am sure he would not want to settle on Mars Mars really needs, get me?—is a confidence man." "You are from Mars. Okay? So you fought bushcats barehanded in an abandoned canal." "What's a bushcat? And we don't have canals. The evaporation rate—" "Well, you see, maybe a man like that is just what Mars does need. And They had instructed him on Mars to take chances if he must. he had landed on Earth less than six hours ago. "On Mars, you mean?" "Yes. There never were any Old Martians. We erected the ruins fifty haul," said Matheny. "Not many Terrestrial archeologists get to Mars and they depend on our people to—Well, anyhow—" "I will be clopped! Good for you!"

<question>:
How did Mars become colonized in the story?

<options>:
A Martians originated from another solar system and colonized Mars
B Martians are uncertain of their own origin because their artifacts were destroyed
C Martians evolved separately on Mars
D Immigration from Earth

<answer>:

D