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

<passage>:
"Oh, that. Sure, I remember—Hey! You didn't!" "Yes. We made about a billion dollars on that one." A hayseed Martian among big-planet slickers ... of course 'What mysterious knowledge did the Old Martians possess? What was on top and tight around the hips. After all, some of the men who knew her private number were important. to a select few—' That's our largest dollar-earning enterprise." He would have liked to say it was his suggestion originally, but it She undulated to the phone and pressed its Accept. "Hello-o, there," Gus Doran's prawnlike eyes popped at her. "Holy Success," he whispered would have been too presumptuous. He was talking to an Earthman, who "That's about all, so far," confessed Matheny. "Perhaps a con is our only hope. I've been wondering, maybe we could organize a Martian "I'll say you do! With a Martian!" bucket shop, handling Martian securities, but—well, I don't know." "Yes?" Matheny faced around, shivering with his own tension. that's who, and if you called up to ask for a piece of him, you can just blank right out again. I saw him first!" "You mean.... Mr. Doran—Gus—you could actually—" or something. I got this Martian for you, see?" "So? Since when has all Mars had as much spending money as one big-time Doran's thin sharp face grinned. "You break that date, Peri. Put it off have experience otherwise with a small nephew, I would say this will be like taking candy from a baby." Peri's peaches-and-cream countenance began to resemble peaches and cream left overnight on Pluto. "Badger?" she asked. awful headache and can't see Mr. Sastro tonight. Where you at, Gus?" 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 through the Martian atmosphere shuddered from the racket conducted by of your planet, Mr. Matheny, regulations force me to ask your business." 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 that no one is interested any more in giving up even second-class "Thanks," said Matheny, "but, you see, I—we need—that is.... Oh, Phobos! he thought wildly. in awe. "You sure the wires can carry that much voltage?" "Well, hurry up with whatever it is," snapped Peri. "I got a date He began walking, disconsolately, at random. His lizardskin shirt and black culottes drew glances, but derisive ones: their cut was forty whenever he did check in. The few Martians who had been to Earth had Of course , he told himself, that's why Matheny puffed smoke and looked around. His feet ached from the weight on them. Where could a man sit down? It was hard to make out any individual sign through all that flimmering neon. His eye fell on one that was distinguished by relative austerity. Enter, Play, Pray That would do. He took an upward slideramp through several hundred feet The Martian crossed the lobby. His pipe went out in the breeze from an or too deep for him. He'd have to relax with a crap game instead. He had been standing at the table for some time before the rest of the congregation really noticed him. Then it was with awe. The first few But when he got the rhythm of it, he tossed a row of sevens. It was a customary form of challenge on Mars. Here, though, they simply pushed chips toward him. He missed a throw, as anyone would at home: simple courtesy. The next time around, he threw for a seven just to get the "I say!" he exclaimed. He looked up into eyes and eyes, all around the green table. "I'm sorry. I guess I don't know your rules." "You did all right, brother," said a middle-aged lady with an obviously surgical bodice. "But—I mean—when do we start actually playing ? What happened to the "Oh. Thanks. Thanks ever so much. I, I, that is—" Matheny cursed his knotting tongue. Damn it, just because they're so much more sleekly pomaded, dapper in blue pajamas with a red zigzag, a sleighbell cloak and curly-toed slippers. Matheny sighed. "A drink is what I need the very most." "My name's Doran. Gus Doran. Call me Gus." They walked back to the deaconette's booth and Matheny cashed what a Martian. I am very interested." "There aren't many of us on Earth," agreed Matheny. "Just a small "We can't afford it," said Matheny. "What with gravitation and made a million years ago by a, uh, extinct race ... I tell you, she appreciated me for it!" He winked and nudged. "Of course," Matheny said ritually, "I agree with all the archeologists "Trouble with it is, I hear Mars is not so comfortable," said Doran. "I Grill, on the 73rd Level. Matheny's jaw clanked down. Matheny followed Doran past a sign announcing that this show was for one has been really successful— I Was a Slave Girl on Mars . "Of course," said Matheny bitterly. "We offer the most liberal "Beer," said Matheny without hesitation. "The only beer on Mars comes forty million miles, with interplanetary instance. But, in principle, I have told him the truth, told him of our need The beer arrived. Matheny engulfed himself in it. Doran sipped at a "A pleasure." "But now you must let me buy you one." "That is not necessary. After all," said Doran with great tact, "with "Oh, we're not that Matheny felt his eloquence running down and grabbed for the second bottle of beer. "But where do I start?" he asked plaintively, for his loneliness smote him anew. "I'm just a college professor at home. How would I even get "I could offer a certain amount of, uh, lagniappe," said Matheny. "That Matheny found himself warming. Gus Doran was an authentic bobber. A he laughed at Matheny's, though they were probably too rustic for a "The best and slickest one on Earth, to operate a world-size con game for us and make us some real money." "A con by any other name," said Matheny, pouring down an akvavit. "By all means." Matheny disposed of his last beer. "I could use some first and some more up-to-date clothes." " Allez allons , or maybe alors ." Oh, well , he thought, himself into another chair, cocked his feet on the 3-D and waved a cigarette. "Which speaking of, what say we get some girls? It is not too late to catch them at home. A date here will usually start around 2100 hours earliest." "What?" While Matheny jittered about, shaving and showering and struggling with He shrugged and gave the Martian a sidelong glance. "Sure, you may not want to say yes, immediately, without reservations. And therefore maybe he became overcautious. They had instructed him on Mars to take chances if he must. instant's hesitation. "I shall never reveal to any person unauthorized by yourself whatever you may tell me under security, now or at any other time," he recited. Then, cheerfully: "And that formula, Pete, happens to be the "Oh, it's simple enough," said Matheny. "It's only that we already are "Yes. There never were any Old Martians. We erected the ruins fifty " Huh? Well, why, but—" haul," said Matheny. "Not many Terrestrial archeologists get to Mars

<question>:
How many different Martian cons did Matheny speak of to Gus?

<options>:
A 4
B 3
C 2
D 1

<answer>:

B