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

<passage>:
and the fine of—" "—one hundred thousand dollars. I know." I groaned and turned to the U.S. copyright on this publication was renewed.] Getting specimens for the interstellar zoo was no problem—they battled for the honor—but now I had to fight like a wildcat to keep a display from making a monkey of me! beings, but there's barely a species anywhere that can resist the old exhibitionist urge. a contingency basis. Get me out of this and you'll have five grand and the contract. Otherwise, nothing." "Send him, her or it in." for my services, transportation and expenses. I'll be required to remain on exhibit no more than one-third of each Terran sidereal day." "And the pay will be—ah—$50 Galactic a week, plus expenses and transportation." The spherical creature clapped his hands in joy, three hands clapping I grinned, pleased with myself. We needed a green Regulan in our show the last one had quit four years ago. But just because we needed him would work for nothing, or even pay us, just so long as we let him get to Earth. My conscience won't let me really exploit four feet high and five hundred pounds heavy. We already had a couple of his species in the show, but they made good crowd-pleasers, being so plump and cheerful. I passed him along to Auchinleck to sign at anything short of top rate. Next came a bedraggled Sirian spider who was more interested in a handout than a job. If there's any species we have a real over-supply of, it's those silver-colored spiders, but this seedy specimen gave it a try anyway. He got the gate in half a minute, and he didn't even get the handout he was angling for. I don't approve of begging. 2903, the World Congress declared Terra off-bounds for non-terrestrial beings, as an offshoot of the Terra for Terrans movement. Before then, anyone could visit Earth. After the gate clanged down, a non-terrestrial could only get onto Sol III as a specimen in a once in his lifetime, and there's only one way he can do it. We don't keep too big an inventory. At last count, we had 690 specimens before this trip, representing 298 different intelligent life-forms. My goal is at least one member of at least 500 different races. When I less than nineteen chlorine-breathing Procyonites wearing gas masks. It was also my sad duty to nix a Vegan who was negotiating through a Ghrynian agent. A Vegan would be a top-flight attraction, being some 400 feet long and appropriately fearsome to the eye, but I didn't see how we could take one on. They're gentle and likable beings, but their upkeep runs into literally tons of fresh meat a day, and not just any old kind of meat either. So we had to do without the Vegan. "One more specimen before lunch," I told Stebbins, "to make it an even dozen." I could tell, the being was quite plainly nothing but an Earthman. "There's been a mistake. We're interested in non-terrestrials only." I don't mind conning the public from time to time, but I draw the line at getting bilked myself. "Look, friend, I'm busy, and I'm not known for my sense of humor. Or my generosity." happen to be a representative of the only Earthlike race that exists from Earth, stranded here and out of cash. You want a free trip back to Earth. No deal. The demand for beings from Wazzenazz XIII is pretty low This was the best con switch yet—an Earthman posing as an alien to get only one human race in the Galaxy—on Earth. I was going to need some and said no to a scaly pseudo-armadillo from one of the Delta Worlds. warlike race. I said, "You'll have to understand, Freeman Heraal, that it's not our policy to maintain more than a few members of each species at our Institute. And we're not currently in need of any Kallerian males, because—" "You will hire me or trouble I will make!" didn't move. He bellowed, "I have vowed a vow, Earthman. Take me to Earth, enroll a Gursdrinn, or the consequences will be terrible!" The alien was a pathetic sight: a Stortulian, a squirrely-looking creature about three feet high. His fur, which should have been a lustrous black, was a dull gray, and his eyes were wet and sad. His of Earth. And I am alone, bound by our sacred customs never to remarry, Earth!" "But—" organization at all—you just want free passage to Earth?" "Yes, yes!" wailed the Stortulian. "Find some other member of my race, sentiment. I felt sorry for this being's domestic troubles, but I wasn't going to break up a good act just to make an alien squirrel happy—not to mention footing the transportation. I said, "I don't see how we can manage it. The laws are very strict on the subject of bringing alien life to Earth. It has to be for scientific purposes only. And if I know in advance that your purpose in "My heart melts to nothingness for you. But I can't take you to Earth." There's a clause in every contract that allows me to jettison an unwanted specimen. All I have to do is declare it no longer of scientific interest, and the World Government will deport the undesirable alien back to its home world. But I wouldn't pull a low uneasy feeling I had just been talking to a being who was about to commit suicide on my account. About fifty more applicants were processed without a hitch. Then life started to get complicated again. Nine of the fifty were okay. The rest were unacceptable for one reason or another, and they took the bad news quietly enough. The haul for the day so far was close to two dozen new life-forms under contract. I had just about begun to forget about the incidents of the Kallerian's and the Earthman who called himself Ildwar Gorb of Wazzenazz XIII staff." "I don't care what . He doesn't know how to handle alien beings. How many times today has a life-form come in here unexpectedly?" I scowled at him. "Too damn many." "You see? He's incompetent. Suppose you fire him, take me on instead. I've been living in the outworlds half my life I know all there is to go home to Earth. I don't want you hanging around here bothering me. being—" "—that your unethical actions have directly contributed to the untimely death of an intelligent life-form," filled in the second of "And therefore," said the third lizard, "it is our duty to arrest responsible?" "This is the law. Do you deny that your stubborn refusal to yield to this late life-form's request lies at the root of his sad demise?" "Well, no, but—" "Failure to deny is admission of guilt. You are guilty, Earthman." Closing my eyes wearily, I tried to wish the whole babbling lot of them away. If I had to, I could pony up the hundred-grand fine, but it was going to put an awful dent in this year's take. And I shuddered when I remembered that any minute that scrawny little Stortulian was likely to come bursting in here to kill himself too. Was it a fine of $100,000 per suicide? At that rate, I could be out of business by nightfall. I was spared further such morbid thoughts by yet another unannounced arrival. to do." I was quivering at the thought of another hundred thousand smackers going down the drain. "Stop him, somebody! He's going to kill himself! He's—"

<question>:
Why was the Vegan not chosen to make the trip to Earth?

<options>:
A There were too many of his kind already in inventory.
B They were worrisome and difficult to work with.
C He was much to large in size to accommodate.
D The upkeep for the species was too much.

<answer>:

D