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

<passage>:
GRIFTERS' ASTEROID By H. L. GOLD Harvey and Joe were the slickest con-men ever to gyp a space-lane sucker. Or so they thought! Johnson asked skeptically: "How about a sample first?" Extensive research did not uncover any evidence that Characteristically, Harvey Ellsworth tried to maintain his dignity, "What is?" asked Harvey through a mouthful of cotton. In their hectic voyages from planet to planet, the pair of panacea purveyors had encountered the usual strange life-forms. But never had remaining pair. The bartender, a big man resembling the plumpish Harvey in build, was leaning negligently on the counter, ordering this impossible being to fill the partly-emptied bottles, squeeze fruit juice and sweep the floor, all of which the native did simultaneously. "Nonsense," Harvey croaked uncertainly. "We have seen enough queer Harvey and Joe were breathing hard from having gulped the water so impersonal eyes studying them shrewdly. "Strangers, eh?" he asked at last. "Solar salesmen, my colonial friend," Harvey answered in his usual lush manner. "We purvey that renowned Martian remedy, the ancient ruined city of La-anago. Medical science is unanimous in proclaiming this magic medicine the sole panacea in the entire history "Got a mechanic around this dumping ground you call a port?" Joe asked. Harvey grinned puzzledly. "We didn't take any whiskey." Harvey's eyes bulged. Joe gulped. "That—that's robbery!" the lanky man The barkeeper shrugged. "When there ain't many customers, you gotta "Besides nothing!" Joe roared, finding his voice again. "You dirty "You dirty crook!" Joe roared. "Robbing honest spacemen!" sometimes overactive. You were going to say—?" The round face of the barkeeper had assumed an aggrieved expression. "Folks are always thinkin' the other feller's out to do 'em," he said, "Friend," said Harvey, taking out a wallet and counting off eight unconscionable interjection of a middleman between Nature and man's proper amount. Then Johnson rubbed his thumb on his index finger and Harvey bravely counted off the bills. He asked: "But what are we to Johnson's response almost floored them. "Who said anything about "Now do you see, my hot-tempered colleague?" said Harvey as he and Joe picked up buckets that hung on the tank. "Johnson, as I saw instantly, a faint suspicion alive in him. So he called Harvey and they went to that was unmistakably a buried pipe. "What's this doing here?" Harvey asked, puzzled. "I thought Johnson had "Wonder where it leads to," Joe said uneasily. the saloon," said Harvey, his eyes rapidly tracing the ." Mutely, Harvey pointed out a pipe-end jutting under the water. conscience." "The asteroidal Poobah has tricked us with a slick come-on," said Harvey slowly. His eyes grew cold. "Joseph, the good-natured artist in me has become a hard and merciless avenger. I shall not rest until we have had the best of this colonial con-man! Watch your cues from this point hence." Him and me are the whole Earthman population of Johnson City." "You don't need any more," said Harvey, dismayed. Johnson's eight-foot son, topped by a massive roof of sun-bleached hair and held up by a foundation that seemed immovable, had obviously been born and raised in low gravity. For any decent-sized world would have "Of course," replied Harvey calmly. "Any fool knows the first symptoms ?" demanded Johnson. "I come down with it Harvey helped Joe to the counter and lifted him up on it. The mayor and Instead of replying, Harvey hurried outside to the ungainly second-hand When Joe tried to pull away, Harvey was inexorable. He made his partner Joe recoiled. "I'm fine now!" he cried, and sprang off the bar to prove Astonished, Johnson and his son drew closer. They searched Joe's face, " never fails, my friend," Harvey explained. "By "We do not sell this unbelievable remedy," Harvey replied with dignity. handicraftsmanship." Johnson stabbed out a warning finger. "No tricks now. I want a taste of that stuff. You're not switching some worthless junk on me." "Medicine," Harvey propounded, "should taste like medicine." To Joe he snake oil?" "That was not poison," Harvey contradicted quietly. "It was Harvey looked reprovingly at his gangling partner. "Did Johnson ask to Harvey stopped filling bottles and looked up pensively. suckers. Later, a brief period of demonstrating his abilities on the audio-visiphone. Then our triumph—we shall sell him at a stupendous figure to the zoo!" Joe was still dazed by that monetary vista when he and Harvey carried out the money into Harvey's hand, at a moderate rate that precariously Harvey and Joe looked at each other. They hadn't been thinking about " "Your hospitality," said Harvey, "depends on the prices you charge." Swiftly, Harvey conned the possibilities of being bilked again. He saw none. Johnson immediately fell into the role of "mine host." Harvey and Joe studied the menu critically. The prices were phenomenally low. When they glanced up at Johnson in perplexity, he culinary wealth of this planetoid and all the system. And the service was as extraordinary as the meal itself. With four hands, Genius played , using his other two "We absolutely must purchase this incredible specimen," Harvey whispered excitedly when Johnson and the native were both in the to women like Mrs. van Schuyler-Morgan, merely for his hire." complained Harvey. "I wish Johnson would stay either swindler or honest As if on cue, Genius came out and put the check down between Joe and Harvey. Harvey picked it up negligently, but his casual air vanished in Johnson didn't answer. Neither did Genius Harvey focused on the microscopic print, and his face went pasty with Johnson, the "sheriff," collected the money, and Johnson, the "restaurateur," pocketed it. Meanwhile, Harvey tipped Joe the sign to "I don't get the connection," objected Johnson. "It doesn't matter any longer," Harvey said with elaborate "That's right," Johnson came back emphatically. "But what would your "Either one. It don't make no difference. Genius is too valuable to "Oh, come now, Mr. Johnson. Don't tell me no amount of money would Johnson. "I should imagine you will be rather lonely, with only your Harvey forcibly removed his eyes from the native, who was clearing off worst and expects nothing better. the ship," Harvey instructed. To Johnson he explained: "You must see "We must not be selfish, my boy," Harvey said nobly. "We have had our On a larger and heavier world than Planetoid 42, Johnson's curiosity his part, Harvey allowed that curiosity to grow like a Venusian amoeba political speech-makers." "Do not jump to hasty conclusions," Harvey cautioned. "Another word, and I shall refuse you the greatest opportunity any man has ever had, with the sole exceptions of Joseph, myself and the unfortunate inventor Harvey nodded in relief. "We have attempted to repay our host, Joseph. "To make a long story, Mr. Johnson," he said, "Joseph and I were among that was a malicious lie, spread by the doctor's enemies to discredit "This what?" Johnson blurted out. "In simple terms," clarified Harvey, "the ingenious doctor discovered "It does, Mr. Johnson! Only charlatans like those who envied Doctor Johnson recoiled. "No—no, "Why, I don't know," Johnson said in confusion. "For three years, Joseph and I lost sleep and hair, trying to detect

<question>:
Despite what they told Johnson, what can be determined as Harvey and Joe's true occupation?

<options>:
A Sales men
B space-side mechanics
C Traveling gamblers
D Con artists

<answer>:

D