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

<passage>:
Doctor Universe By CARL JACOBI Grannie Annie, who wrote science fiction under the nom de plume of Annabella C. Flowers, had stumbled onto a murderous plot more Spacemen's Club in Swamp City when the Venusian bellboy came and tapped me on the shoulder. Spacemen's was a sanctuary, a rest club where Grannie Annie! calm defiance. I barged across the lounge and seized her hand. "Grannie Annie! I "Hi, Billy-boy," she greeted calmly. "Will you please tell this friend of yourth, you'll have to take her away. It'th abtholutely againth the ruleth...." and Grannie Annie her usual whisky sour—I waited until she had tossed Spacemen's ? What happened to the book you were writing?" "Hold it, Billy-boy." Laughingly she threw up both hands. "Sure, I knew But to me she was still Grannie Annie, as old-fashioned as last year's She was the most completely delightful crackpot I had ever known. "What happened to Grannie spilled a few shreds of Martian tobacco onto a paper and deftly Pluto ." I grinned. "All complete, I'll bet, with threats against the universe and beautiful Earth heroines dragged in by the hair." your hero fall in love with a bug-eyed monster." "I almost forgot, Billy-boy. I'm due at the Before I realized it, I was following her through the lounge and out to the jetty front. Grannie Annie hailed a hydrocar. Five minutes later we In front was a big sign. It read: ONE NIGHT ONLY DOCTOR UNIVERSE AND HIS NINE GENIUSES THE QUESTION PROGRAM OF tinpan piano in the pit. Grannie Annie pushed me into a seat in the yet." The piano struck a chord in G, and the curtain went rattling up. On the stage four Earthmen, two Martians, two Venusians, and one Mercurian advanced to the footlights. "People of Swamp City," he said, bowing, "permit me to introduce myself. I am Doctor Universe, and these are my nine experts." There was a roar of applause from the Satellite From the left wing Grannie Annie appeared. She bowed and took her place on the dais. The Doctor's program began. The operator of the Earth visi twisted his dials and nodded. Blue light flickered on the pantascope panel to voice echoed through the theater: Who was the first Earthman to titter the sunward side of Mercury? " Doctor Universe nodded and turned to Grannie Annie who had raised her hand. She said quietly: "Charles Zanner in the year 2012. In a specially constructed And so it went. Questions from Mars, from Earth, from Saturn flowed in the visi sets. Isolated miners on Jupiter, dancers in swank Plutonian cafes strove to stump the experts. With Doctor Universe offering bantering side play, the experts gave their answers. When they failed, or when the Truthicator flashed a red light, he announced the name of It grew a little tiresome after a while and I wondered why Grannie had brought me here. And then I began to notice things. seemed to have lost much of its original fervor. They applauded as before but they did so only at the signal of Doctor Universe. The spell created by the man was complete. Pompous and erect, he strode back and forth across the stage like a general surveying his army. His black eyes gleamed, and his thin lips Grannie Annie came out from behind the box office then. She took my arm "Billy-boy, did you see the way that crowd acted?" "What do you mean?" asked abruptly. rays has never been completely analyzed. Like those set up by radium, they are electromagnetic pulsations, but they are also a strange combination of Beta Gamma rays from the Green Flame rock, they produce in the creature's brain a certain lassitude and lack of energy. As the period of exposure increases, this condition guidance. Occasionally, as with the weak-willed, there is a spirit of intolerance. The Green Flames might be said to be an inorganic opiate, a thousand times more subtle and more powerful than any known drug." I was sitting up now, hanging on to the woman's every word. "Now in 2710, as you'd know if you studied your history, the three planets of Earth, Venus, and Mars were under governmental bondage. The cruel dictatorship of Vennox I was short-lived, but it lasted long enough to endanger all civilized life. Grannie Annie lit a cigarette and flipped the match to the floor. If Grannie expected me to show surprise at that, she was disappointed. "So everything, Billy-boy. Do you realize what such a thing would mean I got my pipe out of my pocket, tamped Martian tobacco into the bowl and laughed heartily. "The same old Flowers," I said. "Tell me, who's your thief ... Doctor Universe?" She regarded me evenly. "What makes you say that?" I shrugged. police officials murdered on Pluto and a demand that government by representation be abolished on Jupiter. The time is ripe for a military dictator to step in. If it had been anyone but Grannie Annie there before me, I would appeared. On the booth wall a scant inch above Grannie's head the Grannie Annie leaped to her feet, grasped my arm and raced for the An instant later we were plunging through the dark night. It was around the camp fire that night that Grannie took me into her Grannie's incredible story? Or was this another of her fantastic plots appeared. Grannie gave a single warning: Grannie Annie fired with deliberate speed. I stood frozen as the diminuendo of its wild cries echoed back to me. tent and faced me with earnest eyes. "Billy-boy, our every move is jetty, and Grannie Annie was introducing me to Ezra Karn. Grannie Annie came to the point abruptly. When she had explained the "What do you mean?" Grannie paused in the act of rolling herself a Earthmen. Strictly speaking, they're no more than a form of energy." "Dangerous?" "Yes and no. Only man I ever heard of who escaped their country outside "Laugh?" A scowl crossed Grannie's face. Several mold guns were borrowed from the prospector's supply to arm the Venusians. And then as we were about to leave, Karn suddenly turned. "The Doctor Universe program," he said. "I ain't missed one in months. You gotta wait 'til I hear it." Grannie frowned in annoyance, but the prospector was adamant. He screen, a curious numbing drowsiness seemed to steal over me and lead futility of the venture. Only the pleadings of Grannie Annie kept me from turning back. On the morrow I realized the truth in her warning, "What's that thing on top?" Karn demanded, puzzled. Grannie gazed a long moment through binoculars. "Billy-boy, take three "Up we go, Billy-boy." Heat gun in readiness, Grannie Annie began to radiations stepped up by an electro-phosicalic process." Karn raised the butt of his pistol and brought it crashing against the "You'll never do it that way," Grannie said. "Nothing short of an atomic blast will shatter that wall. It explains why there are no guards here. The mechanism is entirely self-operating. Let's see if the Green Flames are more accessible." Suspended by insulators from the ceiling over them was a thick metal plate. Grannie stamped her foot. "It's maddening," she said. "Here we are at

<question>:
What brought Billy-boy to the realization of why Grannie Annie had brought him to the Satellite Theater?

<options>:
A The publication of her newest book
B The appearance of Charles Zanner
C The attraction of the performance of the Nine Geniuses
D The spell placed by Doctor Universe

<answer>:

D