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

<passage>:
hair-raising than any she had ever concocted. And the danger from the villain of the piece "Beg pardon, thir," he said with his racial lisp, "thereth thome one to againth the ruleth...." She was the most completely delightful crackpot I had ever known. "What happened to Guns for Ganymede and it wasn't Ganymede , it was There was a roar of applause from the Satellite 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 the winner. It grew a little tiresome after a while and I wondered why Grannie had 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 dragging his cumbersome third leg behind him. Kagors, of course, had an the Red Planet. But the thing that happened there was a throw back to an earlier era. Someone shouted, "Yah, yellow-face! Down with all Kagors!" As one man the crowd took up the cry and surged forward. The helpless Kagor was seized and flung to the pavement. A knife appeared from nowhere, Moments later an official hydrocar roared up and a dozen I.P. men rushed out and scattered the crowd. But a few stragglers lingered to shout derisive epithets. Varsoom country. To make a long story short, I got him talking about his adventures, and he told me plenty." The old woman paused. "Did you ever hear of the Green Flames?" she asked abruptly. I shook my head. "Some new kind of ..." "It's not a new kind of anything. The Green Flame is a radio-active rock once found on Mercury. The Alpha rays of this rock are similar to radium in that they consist of streams of material particles projected at high speed. But the character of the Gamma 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 or cathode rays with negatively charged electrons. "When any form of life is exposed to these 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 develops into a sense of impotence and a desire for leadership or 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. cruel dictatorship of Vennox I was short-lived, but it lasted long enough to endanger all civilized life. "The archives tell us that one of the first acts of the overthrowing government was to cast out all Green Flames, two of which Vennox had ordered must be kept in each household. The effect on the people was immediate. Representative government, individual enterprise, freedom followed." Grannie Annie lit a cigarette and flipped the match to the floor. old prospector there in the marsh. Karn told me that on one of his travels into the Varsoom district he had come upon the wreckage of an old space ship. The hold of that space ship was packed with Green Flames!" If Grannie expected me to show surprise at that, she was disappointed. I said, "So what?" "So everything, Billy-boy. Do you realize what such a thing would mean if it were true? Green Flames were supposedly destroyed on all planets after the Vennox regime crashed. If a quantity of the rock were in existence, and it fell into the wrong hands, there'd be trouble. 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 representation be abolished on Jupiter. The time is ripe for a military dictator to step in. "And you can lay it all to the Green Flames. It seems incredible that a single shipload of the ore could effect such a wide ranged area, but in my opinion someone has found a means of making that quantity a thousand en masse appeared. On the booth wall a scant inch above Grannie's head the fresco seemed to melt away suddenly. A heat ray! Grannie Annie leaped to her feet, grasped my arm and raced for the door. Outside a driverless hydrocar stood with idling motors. The old ganet , the tough little two headed pack animal of the Venus hinterland. Any form of plane or rocket would have had its motor instantly destroyed, of course, by the magnetic force belt that encircled the planet's equator. Now our drivers changed to "We're heading directly for Varsoom country," she said. "If we find Ezra Karn so much the better. If we don't, we follow his directions to the lost space ship. Our job is to find that ore and destroy it. You see, I'm positive the Green Flames have never been removed from the ship." Sleep had never bothered me, yet that night I lay awake for hours tossing restlessly. The thousand sounds of the blue marsh droned steadily. And the news broadcast I had heard over the portable visi The thing in the darkness turned like a cam on a rod and drove at us again. This time the old woman's heat gun clicked, and a tracery of purple flame shot outward. A horrible soul-chilling scream rent the air. A moment later something huge and heavy scrabbled across the ground and shot aloft. Grannie Annie fired with deliberate speed. I stood frozen as the diminuendo of its wild cries echoed back to me. multi-celled marine life that lived and died within a space of hours. The Venusians paddled with extreme care. Had one of them dipped his hand into one of those yellow streaks, he would have been devoured in a matter of seconds. At high noon by my Earth watch I sighted a low white structure on one varpa Grannie Annie came to the point abruptly. When she had explained the object of our trip, the prospector became thoughtful. "Green Flames, eh?" he repeated slowly. "Well yes, I suppose I could find that space ship again. That is, if I wanted to." "What do you mean?" Grannie paused in the act of rolling herself a Varsoom country, and that isn't exactly a summer vacation spot." "What are the Varsoom?" I asked. "A native tribe?" "Yes and no. Only man I ever heard of who escaped their country outside because I was alone, and they didn't notice me, and Darthier escaped "That's right," Karn said. "The Varsoom have a strange nervous reaction that's manifested by laughing. But just what it is that makes them laugh, I don't know." Food supplies and fresh drinking water were replenished at the hut. suddenly halted at the top of a hill and leveled his arm before him. There it lay, a huge cigar-shaped vessel of blackened arelium steel, looked, we could see liquid pulse in glass tubes, indicator needles swing slowly to and fro. Grannie nodded. "Some kind of a broadcasting unit. The Green Flames in the lower hold are probably exposed to a tholpane radiations stepped up by an electro-phosicalic process." Karn raised the butt of his pistol and brought it crashing against the 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." In the lower hold disappointment again confronted us. Visible in the feeble shafts of daylight that filtered through cracks in the vessel's hull were tiers of rectangular ingots of green iridescent ore.

<question>:
How is one able to escape the Varsoom?

<options>:
A By laughing
B By using protection of a Venusian
C Use of heat rays
D By throwing Green Flames

<answer>:

A