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

<passage>:
could not survive on the Earth, because the conditions that made him great were gone. The survivors must be Ryzga made a savage, wholly futile effort to lift the weapon in his paralyzed hand. Then his eyes rolled upward, and abruptly he went limp and fell in a heap, like a mechanical doll whose motive power has Dark was the Ryzga mountain and forbidding Var felt Neena beside him, and drew her close. As she sobbed her relief, he continued to look down absently at the dead man. When at last he raised his head, he saw that the drama's end had had a further audience. In the outer doorway, backed by his clansmen, stood Groz, gazing first in stupefaction at the fallen Ryzga, then with something like awe at Var. failed. beyond the conqueror of the Ryzgas?" be death for Var, and for Neena living shame. Which of the two was worse was no longer a simple problem to Var, who had grown much older in the in the light that poured from within. They felt the Watcher rouse, heard his footsteps, and finally saw him—a 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 tower of wisdom and strength. The Watcher was four hundred years old beside him even Groz, who had always seemed so ancient, was like a boy. had not meant to be. The old man grinned toothlessly. "Never fear. Asleep or awake, I watch. is as bad as it was when I was last in it." Hot food and drink were before them almost at once. The Watcher regarded them with compassion as their eyes brightened and some of the shadow of Warming to the old man now, Var sketched his and Neena's history able to do little for them against Groz and his violent kinsfolk. "And what will you do now?" Var grinned mirthlessly. "We haven't much choice, since they're overtaking us. I have only one idea left: we can go where Groz may fear to follow us." Neena returned his gaze without flinching mountain the Ryzgas sleep, as they chose to do when their world Ryzgas will come forth." "Do you believe that?" "The Ryzgas also were men," said the Watcher. "But they were such a race the Ryzgas, there was lust for power, and atrocious cruelty strange plastic substances, debris of artifacts still showing the marks of their shaping—the scattered wreckage of the things they made. And we—we too are a remnant, the descendants of the few out of all humanity 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 "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 Var and Neena stared, unstirring, with wide vacant eyes, while the old 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. world, compared to that the Ryzgas made and will make again." Neena pressed her face against Var's shoulder, hiding her eyes. In her own limbs, his face was a numb mask. Dully he heard the old man say, "You are tired. Best sleep until morning." sleep had refreshed his mind and body—realizing also that a footstep had wakened him. Across the cave he faced a young man who watched him Neena sat up and stifled a cry of fright. Var growled, "Who are you? Where's the Watcher?" The other flashed white teeth in a smile. "I'm the Watcher," he answered. "Often I become a youth at morning, and relax into age as the day passes. A foolish amusement, no doubt, but amusements are few here." "You made us fall asleep. Groz will be on us—" "Groz and his people could not detect your thoughts as you slept. They Var passed a hand across bewildered eyes. Neena said softly, "Thank you, rested, your minds are clear. Do you still mean to go on to the Ryzga face was unsmiling. "It is this. You, Var, can flee up the canyon to the That possibility had not occurred to them at all. Var and Neena looked and you again—that cannot be Ryzga mountain." "You are ready to go," said the Watcher. He spoke aloud, and his voice was cracked and harsh. Var opened his eyes in surprise, and saw that the Watcher had become again the hoary ancient of last night. only by its echo in Neena's "You have taken life in your own hands," rasped the Watcher. "Who does that needs no blessing and feels no curse. Go!" cross the gorge more surely and swiftly. When Var and Neena set foot at Var and Neena turned. Far out in the sea of fog, on a dream bridge that they could not see, stood Groz. He shook the staff he carried. It was 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. Neena's hand tightened on Var's. Var sent a thought of defiance: "Go Neena reel against him until, summoning all his strength, he broke the Neena's face was deadly pale and her lips trembled, but her urgent At Var's thought command Neena froze instantly. "Feel that!" he mechanical servitors of the Ryzgas woke one by one and began to make Without warning, lights went on. Blinking in their glare, Var and Neena Var and Neena huddled frozenly, half expecting each instant to be their last. And the Ryzga too stood motionless, looking down at them. He was a man of middle height and stocky build, clad in a garment of his other hand rested as for support against the frame of the doorway. 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 close his mind in the presence of inferior creatures.... 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 seven feet tall, flapping black amorphous limbs and flashing red eyes 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 such evil that for an instant he almost faltered. But the Ryzga's efforts, as he strove to free himself from the neural hold, were as Var had guessed right. When Neena in her terror had flung a dream 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 man

<question>:
How is the Ryzga different from Var and Neena?

<options>:
A He ages backwards
B He cannot spin dreams
C He is immortal
D He is a zombie

<answer>:

B