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

<passage>:
JUPITER'S JOKE By A. L. HALEY Casey Ritter, the guy who never turned down a dare, breathed a prayer to the gods of idiots and spacemen, and headed in toward the great red spot of terrible Jupiter. fall and the head man intone the sentence that would take me out of circulation for a long, long time. And instead, blast me, if they didn't foul me with this trip to good old Jupiter. I didn't get it at first. I'd argued with 'em, but inside I'd been all set for the sentence, and even sort of reconciled to it. I could even hear the words in my mind. But they didn't match what the judge was saying. I stood there gaping like a beached fish while I sorted it out. Then I croaked, "Jupiter! What for? Are you running outa space in stir? Want to choke me to death in chlorine instead?" Being civil to the court didn't seem important just then. Jupiter was worse than the pen, a lot worse. Jupiter was a death sentence. The senior judge rapped sharply with his gavel. He frowned me down and then nodded at the judge on his right. This bird, a little old hank of "You've no doubt heard tales of the strange population of Jupiter," he said. "Every spaceman has, I am sure. Insect-like creatures who manifestly migrated there from some other system and who inhabit the Red Spot of the planet, floating in some kind of artificial anti-gravity field in the gaseous portion of the atmosphere—" I snorted. "Aw, hell, judge, that's just one of those screwy fairy At the thought my larynx froze up tight. This was worse than I'd thought. Government men trapping me and then beaming at me. And a full I squeezed out more when I saw those pictures, though. Those inhabitants were charming, just charming if you like scorpions. Well, a cross between a scorpion and a grasshopper, to be accurate. Floating among that red stuff, they showed up a kind of sickly purple turning to gangrene around the edges. collapsed onto my chair. A crafty-eyed buzzard across the table leaned toward me. "So this is the great Casey Ritter, daredevil of the Solar System!" he sneered. "Never loses a bet, never turns down a dare!" I shuddered. "You're telling that one! And besides, a man's got to draw They were really stumped. They hadn't expected me to take this attitude at all. No doubt they had it figured that I'd gratefully throw myself into a sea of ammonia among man-size scorpions just for the hell of it. Nuts! After all, in the pen a man can eat and breathe, and a guard won't reach in and nip off an arm or leg while he's got his back turned. How stupid could they get? super-sacred, super-secret temple of the cavern-dwelling tribe of Killicuts on Mars—the real aborigines. Bleachies, we call them, sort of contemptuously won't give me fer 'em—" He whistled appreciatively, thinking about it. "Jupiter!" I goggled at him. "Akroida! Who's she?" He looked at me as if I hadn't yet got out from under the rock where he was sure I'd been born. "Don't you know nothin', butterhead?" again. The memory still makes me fry. "Akroida," he explained in his own sweet time, "is the queen-scorp of them idiotic scorpions that lives on Jupiter. I sold her the Halcyon Diamond that disappeared from the World Museum five years ago, remember?" He winked broadly. "It come from Mars in the first place, if it wasn't so much trouble to dig 'em out—" He went off into a dream about the rocks on Mars but I jerked him back. "You mean those scorpions have really got brains?" "Brains!" he snorted. "Have they got brains! Why, they're smarter than them emeralds." I went back to my cot that night, and this time instead of biting my nails, I bit myself. So I faced it. Casey Ritter lost his nerve, and along with it, the chance of a lifetime. A better man than me had already penetrated the Great Red Spot of old Jupiter and come out alive. That thought ate me to the quick, and I began to wonder if it was too late, after all. I could hardly wait for morning to come, so letter to the S.S.C. The Big Sneer of the conference table promptly dropped in on me, friendly as a bottle of strychnine. But for a lad headed for Jupiter that took me in was colorblind, so I didn't have no warning at all. I found out that them scorpions can't stand yeller. It just plain drives them nuts! Thought they'd chaw me up and spit me out into the chlorine before I could get outa the damn thing. If my colorblind pal with a green an' poiple spacesuit—them's the real Jupiter colors—an' Jupiter's farthest moon then they took me in to the edge of Jupiter's ice-cloud and turned me loose in a peanut of a space boat with old Jupe looming ahead bigger than all outdoors and the Red Spot dead ahead. I But my green boat must have showed up like a lighthouse in all that red, because it wasn't long until I spotted a purple and green hopper-scorp traveling straight toward me, sort of rowing along with a pair of stubby wings. He didn't seem to be making much effort, even my Scorpion-Come-Hither lure on the chest of my spacesuit, opened the lock, and popped out, brave as could be. Face to face with that thing, though, I nearly lost my grip on the handle. In fact, I'd have fainted He lolled his hideous cranium practically on my shoulder. "Anything! Just anything you desire, my dearest friend." I tried to back off from him a bit, but the ship stopped me. "I'm Casey natural lump on his back, and he darted away from me. I opened the throttle and tore after him among the immense red blobs that were now beginning to be patterned with dozens of green-and-purple scorpions, all busy filling huge baskets with buds and tendrils, no doubt. Other scorpions oared and floated about in twos and threes in a free and peaceable manner that almost made me forget that I was scared to on Jupiter. But I mean it was even queerer than that. It was like no as solid as if on a floor. Which was fine for flying hopper-scorps, but what about Casey Ritter, who hadn't cultivated even a feather? Attaboy, however, had the answers for everything. Towing me from the name?" she demanded. And when he told her, with a bad stutter in his code, she reared up higher on her skinny elbow and glared in my direction. "Casey Ritter? Never heard of him. Where's he from?"

<question>:
What is the significance of the title, “Jupiter’s Joke?”

<options>:
A The joke is that the scorpion-like inhabitants of Jupiter’s Great Red Spot are actually planning an attack, and that they sent Pard to Casey in order to trick the humans into giving them one of their own.
B The joke is that Jupiter’s Great Red Spot is actually made of harmless gas, which means that Casey can fly into it without worrying about protection.
C The joke is that Casey Ritter is being tricked by the scorpion like inhabitants of Jupiter’s Great Red Spot, and that they plan to steal Casey’s emeralds and hold him for ransom.
D The joke is that Casey’s court hearing sentences him to flying into Jupiter’s red spot to face the supposedly deadly, scorpion-like people who live there. In actuality, the scorpion people aren’t as dangerous as thought, which could be a good deal for Casey to take.

<answer>:

D