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

<passage>:
[Transcriber's Note: This etext was produced from "What the devil are you doing on Venus? Don't you know women aren't allowed in the Spacemen's ? What happened to the book you were writing?" She was the most completely delightful crackpot I had ever known. "What happened to Guns for Ganymede Grannie spilled a few shreds of Martian tobacco onto a paper and deftly "It wasn't Guns , it was Pistols and it wasn't Ganymede , it was Pluto ." I grinned. "All complete, I'll bet, with threats against the universe and beautiful Earth heroines dragged in by the hair." Satellite . ONE NIGHT ONLY DOCTOR UNIVERSE AND HIS NINE GENIUSES THE SYSTEM "That damned fossilized dynamo," I muttered. "She'll be the death of me 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 Mercurian, a huge lump of granite-like flesh, sprawled there, palpably myself. I am Doctor Universe, and these are my nine experts." There was a roar of applause from the Satellite audience. When it had planetoles . the visi sets. Isolated miners on Jupiter, dancers in swank Plutonian cafes strove to stump the experts. With Doctor Universe offering seemed to have lost much of its 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 rushed out and scattered the crowd. But a few stragglers lingered to THE JET. Inside was a deep room with booths along one wall. The place was all but deserted. "My last book, Death In The Atom , hit the stands last January," 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. "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 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 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. it was completed, the manuscript was stolen from my study back on 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 times more potent and is transmiting it 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 We had traveled this far by 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 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 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 Grannie Annie fired with deliberate speed. I stood frozen as the diminuendo of its wild cries echoed back to me. "In heaven's name, what was it?" "Then that would mean...?" "That it was sent by our enemy, the same enemy that shot at us in the tent and faced me with earnest eyes. "Billy-boy, our every move is being watched. From now on it's the survival of the fittest." resembled a vast mosaic, striped and cross-striped with long winding the swamp had undergone a chemical change and evolved into a cohesive 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 varpa cloth, the Venus equivalent of buckskin, and on his Karn shook his head. "They're a form of life that's never been seen by 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 Food supplies and fresh drinking water were replenished at the hut. 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." camped that night on a miserable little island where insects swarmed 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, that all of us had been exposed to the insidious radiations. After that I lost track of time. Day after day of incessant rain ... of There it lay, a huge cigar-shaped vessel of blackened half buried in the swamp soil. insulators. Grannie gazed a long moment through binoculars. "Billy-boy, take three 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 plate and their radiations stepped up by an electro-phosicalic process." Karn raised the butt of his pistol and brought it crashing against the glass wall. His arm jumped in recoil, but the glass remained intact. "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." the feeble shafts of daylight that filtered through cracks in the vessel's hull were tiers of rectangular ingots of green iridescent ore.

<question>:
What was supposedly destroyed after the crash of the Vennox regime?

<options>:
A The Varsoom district
B Green Flames
C Ezra Karn, an old prospector
D Gamma rays

<answer>:

B