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 down a dare, breathed a prayer to the gods of idiots and spacemen, and headed in toward the great red spot of terrible Jupiter. and talent and the day the Solar System Customs caught me red-handed smuggling Kooleen crystals in from Mars, I knew I was in that corner, and sewed up tight. Sure, the crystals are deadly, but I was smuggling them legitimately, in a manner of speaking, for this doctor to experiment with. He wasn't 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 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. throat, and told me what for. "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 the great Casey Ritter, daredevil of the Solar System!" he sneered. the Solar System, led like a precious infant right where I'd flatly refused to go! In plain English, I underestimated the enemy. Feeling safe and secure in the grip of the good old Iron College, I relaxed. and after awhile I braced him. when we met, and then I asked him what's his rap this trip. "Oh, a pretty good jolt if they can keep hold of me," he says. "I just He shrugged, but his little black-currant eyes began to sparkle with fresh scent. I couldn't believe it. Those emeralds were in the inner shrine of the super-sacred, super-secret temple of the cavern-dwelling tribe of Killicuts on Mars—the real aborigines. Bleachies, we call them, sort of contemptuously "Jupiter!" I goggled at him. "Akroida! Who's she?" was sure I'd been born. "Don't you know nothin', butterhead?" 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, you know. Mars! What a place fer jools! Damn desert's lousy with 'em, 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. just leave 'em alone. That's all they want, just to be left alone. Peace an' quiet, and lots of methane and ammonia and arsenic, that's fer them. Besides, the space suit rig you got to wear, they can't bite nails, I bit myself. So I faced it. Casey Ritter lost his nerve, and already penetrated the Great Red Spot of old Jupiter and come out 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 and the caper set up. There were a few bits of info that Pard had to shell out, like where the emeralds were, and how to communicate with those scorpions, and how he'd made Akroida mad. with a green an' poiple spacesuit—them's the real Jupiter colors—an' tiny bottle like that boy Aladdin clutching his little old lamp. I'd had a lot of cooperation getting that far. An Earth patrol had slipped down onto the Red Desert of Mars and picked up the Killicut Emeralds from where Pard Hoskins had cached them and safe out in space That twitch of the nose riled me no little. "I ain't failed yet!" I 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 their proper state. I had already gone over the space boat. Yeah, I was as nervous as a cat with new kittens. Feeling again for my little bottle of horrid stench, I breathed a prayer to the god of idiots and That famous Red Spot was that big, too. It kept expanding until the dyed redder than Mars. Then I took the plunge right into it. Surprise! red, because it wasn't long until I spotted a purple and green Meanwhile the hopper-scorp reached the ship. Hastily I squirted some of my Scorpion-Come-Hither lure on the chest of my spacesuit, opened the dead away right there if Pard Hoskins hadn't been there already and lived. If that little shrimp could do it, I could, too. I braced up and tapped out the greeting Pard had taught me. My fiendish-looking opponent tapped right back, inquiring why the hell into steaks for just any meal. But the tone was friendly and even intimate—or rather, the taps were. There was even a rather warm expression discernible in the thing's eyes, so I took heart and decided to ignore the ferocious features surrounding those eyes. After all, the expression. I tapped back very politely that he must be mistaking me for someone else. "I've never been here before, and so I've never met the charming suit for awhile, so I held on. Then that monstrosity reeled in the eye, and I gagged again. My actions didn't bother him a bit. "Jewels, did you say?" he tapped tap out yes. He drifted closer close enough to get a whiff.... A shudder of ecstasy stiffened him. His head and eyes rolled with it, I tried to back off from him a bit, but the ship stopped me. "I'm Casey one of those head-pieces they used to put on suits of armor instead of the usual plastic bubble. And it was rigged out with phony antennae and mandibles and other embellishments calculated to interest my hosts. Whether it interested them or not, it was plenty uncomfortable for me. Peeking out the porthole I saw that my guide was fidgeting and looking and out like they had all the time in the world. I stared until my eyeballs felt paralyzed. airlock. III That palace was like nothing on earth. Naturally, you'll say, it's on Jupiter. But I mean it was even queerer than that. It was like no what about Casey Ritter, who hadn't cultivated even a feather? endured, and then without warning tossed me onto his back above the little box and flew off with me along a tunnel with luminous red walls. We finally came to the central hall of the palace, and at the sight glowed like the inside of a red light. could hear her question reverberate away over where I was. "Who from?" asked Akroida. That conversation was telegraphed to me blow by blow by the actions of those hopper-scorps. I didn't need their particular brand of Morse Code at all. "Who from?" Attaboy cringed lower and blushed a purple all-over blush. "Dear lady, it is from an interspace trader who possesses some truly direction. "Casey Ritter? Never heard of him. Where's he from?" to the—uh—trader. He does seem to resemble an—ah—earthman." He ducked his head and fearfully waited.

<question>:
What didn't surprise Casey about Jupiter?

<options>:
A the red coloring was plants
B items could float in mid-air
C the aliens could remove their eyeballs
D the aliens communicated by tapping

<answer>:

D