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?" tall, gangling partner was already stumbling out, mouthing something incoherent. They met in the doorway, violently. "We're delirious!" Joe cried. "It's a mirage!" Harvey in build, was leaning negligently on the counter, ordering this juice and sweep the floor, all of which the native did simultaneously. "Water—quick!" Harvey and Joe were breathing hard from having gulped the water so glasses without washing them. "Where you heading?" "Got a mechanic around this dumping ground you call a port?" Joe asked. "Then where's the water lead-in? We'll fill up and push off." Harvey grinned puzzledly. "We didn't take any whiskey." Harvey nudged him warningly. "Easy, my boy, easy." He turned to the bartender apologetically. "Don't mind my friend. His adrenal glands are more to charge for water than it does for you to pay. I just got to, Harvey bravely counted off the bills. He asked: "But what are we to preposterous. We simply can't afford it." Johnson's response almost floored them. "Who said anything about After giving them directions that would take them to the free-water "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, "Just the same," Joe griped, "paying for water isn't something you can a faint suspicion alive in him. So he called Harvey and they went to "What's this doing here?" Harvey asked, puzzled. "I thought Johnson had But Joe was already on his knees, scooping up a handful of water and They rushed back to the first pool, where Joe again tasted a sample. "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 Fists clenched, the two returned to the saloon. But at the door they stopped and their fists unclenched. The pursuit of vengeance, Harvey realized, had taken a quick and unpleasant turn. Something shrewd was called for.... "Joseph!" he exclaimed, looking at his partner in alarm. "Don't you feel well?" Even before the others could turn to him, Joe's practiced eyes were gently crossing. He sagged against the door frame, all his features drooping like a bloodhound's. "Bring him in here!" Johnson cried. "I mean, get him away! He's coming ?" demanded Johnson. "I come down with it every year, and I ain't hankering to have it in an off-season. Get him out of here!" Harvey helped Joe to the counter and lifted him up on it. The mayor and his gigantic offspring were cowering across the room, trying to breathe in tiny, uncontaminating gasps. Instead of replying, Harvey hurried outside to the ungainly second-hand When Joe tried to pull away, Harvey was inexorable. He made his partner waited for the inevitable result. Joe's performance was better than ever. He lay supine for several moments, his face twisted into an expression that seemed doomed "Maybe you need another dose," Harvey suggested. Joe recoiled. "I'm fine now!" he cried, and sprang off the bar to prove it. Astonished, Johnson and his son drew closer. They searched Joe's face, "Medicine," Harvey propounded, "should taste like medicine." To Joe he With Joe stumbling along behind, he left the saloon, crossed the clearing and entered the ship. As soon as they were inside, Joe dropped mind you. Was I to mix the extract with the water for which we had been "But why use it on me?" Joe demanded furiously. Harvey looked reprovingly at his gangling partner. "Did Johnson ask to taste it, or did he not? One must look ahead, Joseph. I had to produce the same "Okay, okay," Joe said. "But you shoulda charged him more." "Joseph, I promise you that we shall get back every redsent of which that swindler cheated us, besides whatever other funds or valuables he possesses. We could not be content with less." "Well, we're starting all right," admitted Joe. "How about that thing with six arms? He looks like a valuable. Can't we grab him off?" Harvey stopped filling bottles and looked up pensively. Joe was still dazed by that monetary vista when he and Harvey carried Harvey and Joe looked at each other. They hadn't been thinking about food at all, but suddenly they realized that they were hungry. "It's only water we were short of," Harvey said apprehensively. "We've Swiftly, Harvey conned the possibilities of being bilked again. He saw none. "Let's take a look at the menu, anyhow, Joe," he said guardedly. Harvey and Joe studied the menu critically. The prices were whispered excitedly when Johnson and the native were both in the complained Harvey. "I wish Johnson would stay either swindler or honest 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 "You can go to hell!" Joe growled. "We won't pay it!" Johnson sighed ponderously. "I was afraid you'd act like that," he said "restaurateur," pocketed it. Meanwhile, Harvey tipped Joe the sign to "It doesn't matter any longer," Harvey said with elaborate "That's right," Johnson came back emphatically. "But what would your "Which one? The one we were going to make, or the one we can make now?" "Either one. It don't make no difference. Genius is too valuable to sell." "Oh, come now, Mr. Johnson. Don't tell me no amount of money would tempt you!" Harvey forcibly removed his eyes from the native, who was clearing off asked with the suspicion of a man who has seen human nature at its worst and expects nothing better. "Joseph, get our most prized belonging from the communications room of Joe's face grew as glum as Johnson's had been. "Aw, Harv," he protested, "do we have to sell it? And right when I thought we were getting the key!" chance now we must relinquish Fate to the hands of a man who might have more success than we. Go, Joseph. Bring it here." Unwillingly, Joe turned and shuffled out. his part, Harvey allowed that curiosity to grow like a Venusian amoeba "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 of this absolutely awe-inspiring device." saying I'll buy, but what is it I'm turning down?" Again Harvey smashed his fist down. "Do you dare to repeat the scurvy 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 the simple key that would translate the somewhat metamorphosed failed. But that was understandable a sensitive soul like his could stand only so much. And the combination of ridicule and failure to

<question>:
Why do Harvey and Joe change thier plan when confronting Johnson about the water?

<options>:
A Joe suddenly feels unwell, and Harvey needs to help him.
B They want to buy Genius, and don't want there to be bad blood.
C Joseph's son is large and intimidating, and they want to avoid a fight.
D They don't think they could take Joseph in a fight.

<answer>:

C