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

<passage>:
luck had run its course, and now he was marooned on a rogue planet—fighting to save himself from a menace weapons could not kill. perpetual wonder—limpid as a child's. The barbaric rhythms of the in Dennis' mind he frowned slightly as the maneuvers of the Mercurian dancer, who writhed among the guests of the notorious pleasure palace, began to leave no doubt as to her intentions. The girl was beautiful, in a sultry, almost incandescent sort of way, but her open promise left him cold. He wanted solitude, somewhere to coordinate his thoughts in silence and salvage something out of the wreck of his heart, not to speak of his career. But Venus, in the throes of a gigantic boom solitude—the fatal one of her swamps and virgin forests. Dennis Brooke was thirty, the time when youth no longer seems unending. When the minor adventures of the heart begin to pall. If the loss of Marla left an aching void that all the women of five planets could not fill, the loss of Space, was quite as deadly. For he had been grounded. True, Koerber's escape from the I.S.P. net had not quite been his fault but had he not been enjoying the joys of a voluptuous Jovian Chamber, in Venus' fabulous Inter-planetary Palace, he would have been ready for duty to complete the last link in the net of I.S.P. cruisers that almost surrounded the space pirate. A night in the Jovian Chamber, was to be emperor for one night. Every dream of a man's desire was marvelously induced through the skilful use of hypnotics the unearthly peace of an Olympus descended on a man's soul, and beauty ... beauty such as men dreamed of was a warm reality sheaf of credits—it had cost him the severe rebuff of the I.S.P., and most of his heart in Marla. Dennis sighed, he tilted his red, curly head and drank deeply of the insidious Verbena Dennis couldn't tell. But his senses became instantly alert. Danger brought a faint vibration which his superbly trained faculties could instantly denote. His steady, bronzed hand lowered the drink, and his eyes narrowed slightly. Absorbed in trying to puzzle the sudden enmity of this Martian stranger, he was unaware of the Mercurian Dancer. The latter had edged closer, whirling in prismatic flashes from the myriad semi-precious stones that studded her brief gauze skirt. And now, in a final bid for the spacer's favor she flung herself in his lap and tilted back invitingly. Some of the guests laughed, others stared in plain envy at the side as he leaped with deadly intent on the sprawled figure of Dennis cried out. Then the Martian's hand reached out hungrily. But Dennis was Leaping to one side, impervious to the fall of the dancer, he avoided it, flat-footed, without flinching then he let his right ride over sagged to his knees and rolled to the impeccable mosaics of the floor. Dennis, breathing heavily, stood over him until the international police arrived, and then he had the surprise of his life. Upon search, Dennis Brooke shrugged his shoulders, shoulders that would have put to venomous stare of the Mercurian Dancer, of the excited voices of the desk, frowned slightly as Dennis Brooke entered. He eyed the six foot if uncertain how to begin. Finally, he sighed as if, having come to a decision, he were forcing himself to speak: "Sit down, Dennis. I've sent for you, despite your grounding, for Dennis Brooke's space-tanned features had gone pale. His large hazel that smouldered. He stood silent, his hands clenched at his sides, while something cold and sharp seemed to dig at his heart with cruel precision. "Marla!" He breathed at last. The thought of Marla in the power of Koerber sent a wave of anguish that seared through him like an begetting! Let me try, and I promise you ..." in his torture, Dennis was unconsciously banging a knotted fist on the chaste, satiny surface Their nerves were ragged. Days and days of fruitless search for a phantom ship that seemed to have vanished from space, and an equally To all but Captain Brooke, this was a new adventure, their first assignment to duty in a search that went beyond the realm of the inner planets, where men spent sleepless nights in eternal vigilance against stray asteroids and outlaw crews of ruthless vandal ships. Even comfortable luxury that they knew. Day after day they went through their drills, donning space suits, manning battle stations eternally scanning the vast empty reaches by means of the telecast. And suddenly, out of the void, as they had all but given up the search Every member of the crew wanted to be among the boarding party, for all but George Randall, the junior member of the crew had served his apprenticeship among the inner planets, Mars, Venus and Terra. He felt nauseated at the very thought of going out there in that vast abyss of space. His young, beardless face, with the candid blue eyes went pale when the order was given. But presently, Captain Brooke named those who were to go beside himself: Somehow he had expected to find at least one compartment unharmed, where life might have endured, but now, all hope was gone. Only a great resolve to deal with Koerber once and for all remained to him. Dennis tried not to think of Marla, too great an ache was involved in thinking of her and all he had lost. When he finally spoke, his voice was harsh, laconic: "Prepare to return!" Dennis Brooke smiled. His own heart was hammering, and inwardly he member of the crew raced to his assigned task without delay. Action impended, and after days and nights of inertia, it was a blessed relief. Smiles appeared on haggard faces, and the banter of men suddenly galvanized by a powerful incentive was bandied back and forth. All but George Randall. Now that action was imminent. Something gripped his throat until he could hardly stand the tight collar of his I.S.P. uniform. A growing nausea gripped his bowels, and although he strove to keep calm, his hands trembled beyond control. In the compact, super-armored control room, Captain Brooke watched a trap without specific orders. But to Dennis Brooke, directing the chase from the control room, even certain death was welcome, if only he could take Koerber with him. Weaving through the deadly belt for several hours, Dennis saw his With a wrenching turn that almost threw them out of control, Dennis a man didn't exert himself. To the silent crew of the I.S.P. Cruiser, the strange world to which Koerber's magnetic Beam had drawn them, For a long moment the four men looked at each other in silence. Dennis "Probably hiding his head under a bunk!" Dallas laughed with scorn. His contemptuous remark voiced the feelings of the entire crew. A man who failed to be at his battle-station in time of emergency, had no place in the I.S.P. to find out what happened to Koerber's ship. I must know," he said in a low voice, but with such passion that the others were startled. "Captain ... I ... I wanted ..." he paused unable to continue. "You wanted what?" Captain Brooke's voice was terse. "Perhaps you wanted to explain why you weren't at your battle station?" been an instant when he'd found Randall cowering in the rocket-room, in the grip of paralyzing hysteria, when he could cheerfully have wrung mouth to speak further, but feeling the other's calculating gaze upon him, he whirled and re-entered the ship. "But for him we wouldn't be here!" Dallas exclaimed. "Aagh!" He shook his head in disgust until the several folds of flesh under his chin shook like gelatin. "Cowards are hell!" He spat.

<question>:
Why did Dennis frown at the dancer?

<options>:
A It was too cold
B She was writhing
C She was beautiful
D He wanted to be left alone to think

<answer>:

D