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

<passage>:
Elath Taen made mad music for the men of Mars. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] In all the solar system there is no city quite like Mercis, capital of Mars. Solis, on Venus, is perhaps more beautiful, some cities of Earth certainly have more drive and dynamitism, but there is a strange inscrutable air about Mercis which even terrestials of twenty years' residence cannot explain. Outwardly a tourists' mecca, with white plastoid buildings, rich gardens, and whispering canals, it has another Steve Ranson, mounting the steps of the old house facing the Han canal, was in no mood for the bizarre beauties of Martian scenery. For one thing, Mercis was an old story to him his work with Terrestial Intelligence had brought him here often in the past, on other strange cases. And for another thing, his mission concerned more vital matters. Jared Haller, as head of the state-owned Martian Broadcasting System, was next in importance to the august Governor Winship himself. As far back as the Hitlerian wars on earth it had been known that he who controls propaganda, controls the nation ... or planet. Martian Broadcasting was an important factor in controlling the fierce warlike The house was provided with double doors as protection against the sudden fierce sandstorms which so often, in the month of Tol, sweep in from the plains of Psidis to engulf Mercis in a red choking haze. Ranson passed the conventional electric eye and a polite robot voice asked his name. He gave it, and the inner door opened. Jared Haller nodded. He was a big, rough-featured individual with gray closer, he could see lines of worry, of fear, etched about the strong Ranson put it directly. "Why did you require the help of T.I., Mr. Haller?" he asked. "Because we're up against something a little too big for the Mercian police force to handle." Jared Haller's strong hands tapped nervously upon the desk. "No one has greater respect for our local authorities Ranson nodded, eyes intent as the pattern unfolded. with the terrestial oppressors' and there'd be a revolution. Millions of reddies against a few police, a couple of regiments of the Foreign Legion. It'd be a cinch." saw. The police rayed him in the struggle. The following week Pegram, the musical director, died of a heart attack. Died with the most terrorized expression on his face I've ever seen. Fear, causing the heart attack, his doctor said. You begin to see the set-up? Three men, each a vital power in M.B.C. gone within three weeks! And who's next? Who?" Jared Haller's eyes were bright with fear. "Suicide, insanity, heart attack." Ranson shrugged. "All perfectly For a long brittle moment Jared Haller stared out at the graceful white Ranson again, his eyes were bleak as a lunar plain. "It's all right." Jared Haller grinned crookedly. "I'm not insane. Yet. was like a man in a trance, bent forward, lips pressed tight until they resembled a livid scar. The room was silent as a tomb strode stiffly to the window, peered out. In the darkness, the broad these, he decided, that their unknown serenader lay concealed. duty, all were fading from his mind. The music was a spur, goading him to wild unreasoning anger. The red mists of hate swirled through his wild music. Berserk rage sounded in each shivering note and Ranson felt tall flinty magnate was now another person. Primitive, atavistic rage distorted his features, insane murder lurked in his eyes. The music was his master, and it was driving him to frenzy. "Kill!" the weird rhythm grinning furiously, and in a moment both men were struggling, teeth bared in animalistic grins, breath coming in choked gasps, whirling As he approached the window the melody grew louder. The hypnotism of Like a sleepwalker he climbed to the sill, stood outlined in the tall was lost in the golden world that the elfin melody conjured up. He Jared Haller lay. Ranson stared at it, as though seeing it for the raced through the house, toward the study. And then, his brain weary as if it had been cudgelled, Ranson slid limply to the floor. Headquarters of the Martian Canal-Patrol was brilliantly lighted by a dozen big astralux staring curiously at Ranson. T.I. man, go free, is impossible." The captain drew a deep breath, motioned to the two gray-uniformed patrolmen. "Take Mr. Ranson." And then Steve Ranson went into action. In one blinding burst of "No good. Got to work fast." Ranson backed toward the door, gun halted him, but a wave of Ranson's T.I. card put the man aside. knew, before Maxwell and his men blasted a way to freedom, set out in pursuit. Like a lean gray shadow Ranson ran, twisting, dodging, among the narrow streets, heading toward Haller's house. Mercis was a dream city in the wan light of the moons. One in either side of the heavens, they threw weird double shadows across the rippling canals, the aimless that he had once more picked up the faint elusive scent. Deeper and deeper Ranson plunged into the dark slums of Mercis. Smoky gambling dens, dives full of drunken spacehands and slim red-skinned girls, maudlin singing ... even the yellow glare of the forbidden At the end of an alley where the purple shadows lay like stagnant he glanced about to make sure no one had light jetted through a half-open door. Ranson moved toward it, silent black fluid did not so much as waver at Ranson's entrance. Ranson gasped. The bizarre figure was that of Dr. Elath Taen, master-scientist, sought by the T.I. for years, in vain! Elath Taen, outlaw and renegade, whose sole desire was the extermination of all terrestials on Mars, a revival of the ancient glories of the red planet. The tales told about him were fabulous behind the unholy music! "Good evening, Mr. Ranson," Elath Taen smiled. "Had I known T.I. men were on Mars I should have taken infinitely more precautions. "Well done, Mr. Ranson." Elath Taen nodded calmly. "Had the acid struck "That's about enough of your tricks!" Ranson grated. "Come along, Dr. Taen! We're going to headquarters!" "Since you insist." Elath Taen removed his chemist's smock, began, very deliberately, to strip off his rubber gloves. "Quit stalling!" Ranson snapped. "Get going! I...." The words faded on "Exactly, Mr. Ranson." Elath Taen smiled thinly. "Listen!" dreamy, crooning chords. A lullaby, that seemed to hang lead weights upon the eyelids. Audible hypnotism, as potent as some drug. Clearer But his words held no force, and Elath Taen was nodding sleepily under think, to move, but his will seemed in a padded vise. The music was Across the laboratory Elath Taen had slumped to the floor, a vague fingers, he fell to his knees. Sleep ... that was all that mattered ... sleep. The music was like chloroform, its notes stroked his brain. soft lulling music. About her head, he noticed, was a queer copper helmet, of a type he had never before seen. And then the girl, Elath Taen, the laboratory, all faded into a kaleidoscopic whirl. Ranson felt himself falling down into the gray mists, and consciousness disappeared.

<question>:
Why was Elath Taen mostly likely smiling as he drifted to sleep?

<options>:
A He had killed Ranson.
B His plan, involving the girl with the box, had succeeded.
C The dark liquid was not really acid after all.
D He would become the leader of Mercis.

<answer>:

B