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

<passage>:
Ryzga made a savage, wholly futile effort to lift the weapon in his with the Ryzgas themselves, who slept within, ready to wake and in stupefaction at the fallen Ryzga, then with something like awe at beyond the conqueror of the Ryzgas?" mountain. Var sensed her fear, and the love that had conquered it. He felt a wave of tenderness and bitterness. For him she had come to this. For the flame that had sprung between them at the Truce of New Grass, she had challenged the feud of their peoples and had left her home, to follow him. Now, if her father and his kinsmen overtook them, it would last days. lurid fire spewed from the Ryzga mountain, and Var sighed, shaking his head. "It won't hold them for long, but it's the never have won through. watch on the Ryzga mountain, as a part of the oldest legends of their shrunken old man, white-haired, with a lined beardless face. The sight of him, more marred by age than anyone they had ever seen before, was disappointing. They had expected something more—an ancient giant, a is as bad as it was when I was last in it." doubt, young man? Such things happened when I was young." Warming to the old man now, Var sketched his and Neena's history briefly. "We should have been safe among my people by now. And before behind us." "A pity, indeed. I would like to help you—but, you understand, I am the Mountain Watcher. I must be above feuds and families." Var nodded somberly, thinking that an old recluse would in any case be "And what will you do now?" mountain the Ryzgas sleep, as they chose to do when their world Ryzgas will come forth." them now as they have for two thousand years. When I had gone that far, the mountain began to shake, the force that is in the Earth rumbled "The Ryzgas also were men," said the Watcher. "But they were such a race as the world has not seen before or since. There were tyrannies before the Ryzgas, there was lust for power, and atrocious cruelty but such They laid the world waste, stripped it of metals and fuels and bored to its heart for energy, poisoned its seas and its air with the fume of that survived when the Ryzgas' world went down in flame and thunder. "In the last generation of their power the Ryzgas knew by their science sure that their works and their knowledge would perish with them. Meanwhile they redoubled the yoke and the punishments, hastening the completion of the last of the starships. "From the memories that the old Watchers have left here, and from the memories of dead men that still echo in the air, I have gathered a that was ever built. Only the angry light of fires relieved the city's shaking of the earth. Along lightless streets, half choked with rubble and with the dead, poured a mad, hating horde. The recurrent flashes lit scarred faces, naked bodies blackened and maimed from the hell of the workshops where the Ryzgas' might had been forged, eyes that stared white and half hope of new life on a world gutted and smoldering from the fulfilment of the Ryzgas' dream, without slogans other than a cry for blood. then the millions found voice. Some roared ferocious threats and curses others cried desolately— "Some of the Ryzgas took flight to the stars, and some perished on world, compared to that the Ryzgas made and will make again." sleep had refreshed his mind and body—realizing also that a footstep day passes. A foolish amusement, no doubt, but amusements are few here." rested, your minds are clear. Do you still mean to go on to the Ryzga the fresh the morning sun, but the mountain of the Ryzgas drank in the light and at one another. Then by common consent they blended their minds into one. They thought, in the warm intimacy of unreserved understanding: " " They said in unison, "No. Not that." Ryzga mountain." only by its echo in Neena's mind did he recognize it as a sense of guilt. He said stiffly, "You don't blame us?" little had the Ryzgas feared those who might assail them in their sleep. response, felt electric currents sting along buried, long-idle circuits.... The two stood shivering together. The morning wind stirred, freshening, the fog lifted a little, and they too far to discern the rage that must contort his features, but the thought he hurled at them was a soundless bellow: "Young fools! I've caught you now!" Behind Groz the figures of his followers loomed up as striding shadows. pulsed briefly with radiant energy that pained the eyes, and went out. had saved them from death in traps like this. But as yet the way was not blocked.... Then they felt the mountain begin to tremble. A very faint and remote vibration at first, then an increasingly potent shuddering of the floor under their feet and the walls around them. Somewhere far below immense mechanical servitors of the Ryzgas woke one by one and began to make neither would yield, though the mountain above them and the world outside should crumble to ruin around them. "Follow us, then!" They plunged deeper into the mountain. And the shaking of the mountain was like that of the terrible city which they had seen in the dream. Through the slow-rolling thunder of the hidden machines seemed to echo the death-cries of a billion slaves, the despair of all flesh and blood before their monstrous and inhuman power. progressive changes in the vast complex of mechanisms for which this and closed in bewildering confusion the two invaders felt the rapid shifting of magnetic fields, the fury of electrons boiling in vacuum.... last. And the Ryzga too stood motionless, looking down at them. That, and his movements when he came slowly down the ramp toward them, conveyed a queer suggestion of weariness or weakness, as if he were yet not wholly roused from his two millenia of slumber. But the Ryzga's manner and his mind radiated a consciousness of power, a pride and assurance of self that smote them like a numbing blow. With a new shock, Var realized that the Ryzga's thoughts were quite symbols. But there was no block. Apparently the Ryzga felt no need to metal parts of a mechanism falling into places prepared for them. The image occurred oddly to Var, to whom such a comparison would ordinarily have been totally strange. initially postulated but this will do. The pessimists were mistaken. We can begin again." Then, startlingly super-imposed on the cool progression of logical thought, came a wave of raw emotion, devastating crawling, laboring to do the Ryzgas' will— The icy calculation resumed: "Immobilize these and the ones Var was staring in fascination at the Ryzga's face. It was a face formed yet it was lined by a deeply ingrained weariness, the signs of premature age—denied, overridden by the driving will they had sensed a moment earlier. It was a sick man's face. The Ryzga's final thought clicked into place: Between the Ryzga and the control panel a nightmare shape reared up and white fangs. The Ryzga recoiled, and the weapon in his hand came up. remained. As the Ryzga stretched out his hand again, Var acted. The Ryzga froze, teetering off balance and almost falling, as a numbing grip closed down on all his motor nerves. the Ryzga's frantic eyes. They glared back at him with such hatred and such evil that for an instant he almost faltered. But the Ryzga's tale—the Ryzga had not recognized it as such, but had taken it for a world, Ryzga! In two thousand Behind the hate-filled eyes the cold brain tried to reason still. "Barbarians...? Our party was wrong after all. After us the machine its fuel. After us

<question>:
Which of these is not a lasting effect of the Ryzgas?

<options>:
A Climate change on the planet
B An increase in technological advancements
C Use of limited resources
D General fear between groups of people

<answer>:

B