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

<passage>:
Planet of No-Return By WILBUR S. PEACOCK The orders were explicit: "Destroy the 'THING' of Venus." But Patrolmen Kerry Blane and Splinter Wood, their space-ship wrecked, could not follow orders—their Planet Stories Winter 1942. Extensive research did not uncover any evidence that and I don't like those infernal pills you keep eating and I—" small box from his shirt pocket, and removed a marble-like capsule. "Better take one of these," he warned. "You're liable to get the space to fly a ship, how to cure space bends, how to handle a Zelta ray, or how to spit—I'll ask you! Until then, you and your bloody marbles can go plumb straight to the devil!" fragrant smoke. "I know all the arguments you can put up ain't that all I been hearing for a week? You take your vitamins A, B, C, D, all you want, but you leave me alone—or I'll stuff your head down your "All right, all right!" Splinter tucked the capsule box back into his pocket, grinned mockingly. "But don't say I didn't warn you. With this shielded ship, and with no sunlight reaching Venus' surface, you're gonna be begging for some of my vitamin, super-concentrated pills before we get back to Earth." Kerry Blane made a rich, ripe noise with his mouth. space warriors. Finally, as a last resort so that he would not be thrown entirely Interplanetary Squadron because of his inherent skill, even though his formal education had been fairly well neglected. Now, the two of them rode the pounding jets of a DX cruiser, bound for Venus to make a personal survey of its floating islands for the Interplanetary Squadron's Medical Division. "Ten to one we don't get back!" Splinter said pessimistically. eyes. His hand unconsciously came up, touched the tiny squadron pin on his lapel. "Sorry to disappoint you, glory grabber," he said mockingly, "but I've " Me! touched the old spacer on the sleeve. "Seventy-eight!" he remarked pleasantly. "Seventy-eight what?" Kerry Blane asked sullenly, the old twinkle beginning to light again deep in his eyes. Venus. Excitement lifted their spirits, brought light to their eyes as they peered eagerly ahead. said, "I'm going to take a nap and try to ease this bellyache of mine. Wake me up so that I can take over, when we land Venus is a tricky place to set a ship on." He yawned again, drifted instantly into sleep, relaxing with the down at his sleeping partner, then turned back to the quartzite port. He shook his head a bit, remembering the stories he had heard about the water planet, wondering—wondering— II Venus was a fluffy cotton ball hanging motionless in bottomless space. Far to the left, Mercury gleamed like a polished diamond in the sunlight. Kerry Blane cut the driving rockets, let the cruiser sink into a fast gravity-dive, guiding it only now and then by a brief eager and reckless, his eyes seeking to pierce the clouds that roiled and twisted uneasily over the surface of the planet. demarcation between the sunward and sunless sides of the planet. He hummed tunelessly, strangely happy, as he peered ahead. a few miles below. Gravity was full strength now, and although not as great as Earth's, was still strong enough to bring a sense of giddiness to the men. which the ship dropped toward the planet. Tendrils of vapor touched the ports, were whipped aside, then were replaced by heavier fingers of cloud. Kerry Blane pressed a firing stud, and nose rockets thrummed in a rising crescendo as the free fall the outer air, then dissipated, as the force-screen voltometer leaped and still the clouds pressed with a visible strength against the ports. The rockets drummed steadily, holding the ship aloft, dropping it slowly toward the planet below. Then the clouds thinned, and, incredibly, were permeated with a dim and glowing light. A second later, and the clouds were gone, and a thousand feet below tumbled and to the far horizon, bathing every detail of the planet in a brilliance more bright than moonlight. Splinter turned a wondering face. "But the official reports say that there is no light on Venus," he exclaimed. "That was one of the reasons given when exploration was forbidden!" Kerry Blane nodded. "That was merely a pretext to keep foolhardy spacemen from losing their lives on the planet. In reality, the ocean is alive with an incredibly tiny marine worm that glows phosphorescently. The light generated from those billions of worms is reflected back from the clouds, makes Venus eternally lighted." He turned the ship to the North, relaxed a bit on the air bunk. He felt tired and worn, his body aching from the space bends of a few hours before. "Take over," he said wearily. "Take the ship North, and watch for any island." They fought in the ocean below, fought in a never-ending splashing of what seemed to be liquid fire. It was like watching a tri-dim screen of a news event, except for the utter lack of sound. One was scaly, while the other was skinned, and both were fully three struck. They threshed in a mad paroxysm of rage, whirling and spinning in the phosphorescent water like beings from a nightmare, exploding out of their element time and again, only to fall back in a gargantuan spray of fluorescence. the ocean to foam, then went limp. The victorious monster circled the ocean's depths. An instant later, the water frothed, as hundreds of lesser marine monsters attacked and fed on the floating corpse. Thirty minutes later, Kerry Blane circled the island that floated free in the phosphorescent ocean. His keen eyes searched the tangled island shaped like a turtle. However, our orders are to investigate every island, just in case there might be more than one of the monsters." turtle-island, make a landing, and take a look around. Later, if we're exploring of the other islands." limitless ocean for the few specks of islands that followed the slow outline of the island, and he whistled softly, off-key, as he nudged the snoring Splinter. "This is it, Sleeping Beauty," he called. "Snap out of it!" "Huh? Whuzzat?" Splinter grunted, rolled to his elbow. "Here's the island." his head, his fingers flickering over the control studs. "Don't get your hopes too high, lad," he counseled. "With those super field. Except for a strip of open beach, the island was a solid mass of plowed into the silvery sand. Belts parted like rotten string bodies twisting involuntarily, as the ship cartwheeled a dozen times in a few seconds. Almost instantly, consciousness was battered from them. he swore monotonously and bitterly for a moment. "Those gol-damned pills you been taking caused the crash!" he roared. "One of them broke and shorted out the control board." He scowled at the incredulous Splinter. "By the three tails of a Martian sand-pup, I ought to cram the rest of them down your throat, boxes and all!" endlessly toward the beach, then turned to gaze at the great fern-like "Won't be any trouble at all to lift the ship," he called. "After rewiring the board, we'll turn the ship with an underjet, swing it you didn't think of it and I most certainly forgot! Solar rays can't penetrate the miles of clouds on Venus. Those guns are utterly useless as weapons!"

<question>:
What are the islands of Venus?

<options>:
A Floating pads covered in jungle
B Exposed continental plates risen to the surface from tectonics
C Volcanic mountains poking out of the sea
D Moons

<answer>:

A