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

<passage>:
Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] The sand-thing was powerful, lonely and strange. No doubt it was a god—but who wasn't? Stinson lay still in the sand where he fell, gloating over the success "I've changed my mind. You will be welcomed." "Listen to that, will you?" Stinson said angrily. "Just listen! You set yourself up as a God for the webfoots. You get them eating out of your hand. Then what do you do? You throw a fit. Yes, a fit! Like an adolescent. Worse." Stinson relaxed. He'd had his say. Sybtl trembled beside him. A small mammal, round, furry, hopped by, sniffing inquisitively. Sybtl said, "Is the Sand God happy?" She shook her head. "No, he is not happy. He is old, old, old. I can feel it. My people say that when one He wanted to run. He wished Benjamin were here. Ben might have an explanation. "What am I afraid of?" he said aloud, "a few grains of sand blowing in the wind? A wind devil?" portion of this planet that suits you. Take the web-footed woman for your wife. Have children. I promise never to harm you in any way." "The webfoots?" "You and they shall share the planet." The Sand God disappeared. Sybtl said "Is the Sand God angry again?" "No, he is not angry." "I'm glad. You will leave now?" sand possibly have a nervous system? It was again going through its paces. Triangle, cube, rectangle, mounting. He became so absorbed in doing this that he failed to notice pool. It was in the language of the web-footed people it was in his own tongue. "No harm must come to this woman. The God with fingers on "I haven't decided. There are these web-footed people, who were hostile until they thought I was a God. They have destructive weapons. Also, I don't understand you. I see you as a cone of sand which keeps changing webfoots use is a toy by comparison. Our scientists found the ultimate nature of physical law. They learned to separate the mind from the God," she said, "to speak to my people again. Their fear of him does not last. When He is gone they will probably kill us." "As for the webfoots," the wind devil, or Sand God, said, "I will destroy them. You and your people will have the entire planet." "Destroy them?" Stinson asked, incredulously, "all these people? They entity, once existing, must not be harmed in any way. To do so changes the most basic structure of nature." The Sand God did not reply. The great bodiless, directionless voice was silent, and Stinson felt as if he had been taken from some high place pleaded. When he looked back, the Sand God was gone. Instantly a new note rose in the cavern. The murmur of unmistakable mob fury ran over the webfoots. Several of the men approached the woman with hatred in their voices. He could not understand the words now. had thoughtfully brought along from the cavern. He took it, and they ran down the slippery path leading away from the entrance. From the hiding place behind a large rock they watched, as several web-footed webfoots were no match for him. He could travel instantly to any spot he chose. But with Sybtl it was another matter he was no better than depended on him. Anyway, he decided, pursuit was impossible. They left no tracks on the ice. They were safe, unless the webfoots possessed talents unknown to him. the webfoots. He stopped, tempted to use his cylinder and move to a warmer, less dangerous spot. The woman pulled on his arm. "We must hurry!" "And because of me even those in the cavern have disowned you." Suddenly she stiffened beside him. There, directly in their path, stood the Sand God. It was blood red now. It pulsed violently. The great voice burst forth. "Leave the woman!" it demanded angrily. "The webfoots are nearing your position." "I cannot leave her. She is helpless against them." The Sand God pulsed more violently than before. Ice melted in a wide area around it. Brown, frozen grass burned to ashes. "You will allow them to kill you, just to defend her life? What The Sand God became a sphere of blue flame. A wave of intense heat drove them backward. "Earthman," the great voice said, "go back to your Earth. Take your inconsistencies with you. Do not come here again to infect my planet with your primitive ideas. The webfoots are not as intelligent as you, but they are sane. If you bring your people here, I shall destroy you all." the thunder of its passing shook the ground and echoed among the lonely hills. Sybtl shivered against his arm. "The Sand God is angry," she said. "My people tell how he was angry once before, when we first came here. He killed half of us and burned the ship that brought us. That is how Kaatr got the tube-weapon. It was the only thing the Sand God didn't Well, Stinson said to himself, that does it. We are better off on Earth. We can't fight a monster like him. Sybtl touched his arm. "Why did the Sand God come? He did not speak." "He spoke to me." "Then he will kill you." She touched her fingers on his face. "I am sorry. It was all for me." "Don't worry. The Sand God travels without a ship, why shouldn't I?" "Now?" "As soon as you are safe. Come." no time, now, to warm cold feet or dwell on the vagaries of Sand Gods. small canyon. They climbed the canyon wall. Far away, small figures moved. The webfoots were on their trail. had heard, or felt the sound for some time, that now its frequency was in an audible range. "The Sand God," Sybtl said. "Sometimes he plays among the clouds. He makes it rain in a dry summer, or sometimes warms the whole world for days at a time in winter, so the snow melts and the grass begins to green. Then he tires and lets winter come back again. He is the loneliest God in the universe." least he does this when he plays. Who knows what he will do when he's angry?" "The Sand God isn't doing this," Stinson said. "It's only a storm." She covered his lips with her fingers. "Don't say that. He may hear you and be more angry." Sybtl shook her head and stroked his face with her long, slim fingers. "Poor little God-with-fingers-on-his-feet," she said. "You do not understand. The Sand God is terrible, even when he plays. See the lightning? It is blue. The lightning of a storm that comes by itself is not blue. He is running around the world on feet like the rockets of emerged from the cave. There was no longer a question of attack from the webfoots, the storm and throwing shadows and coaxing life out into the open again. Down in the canyon a bird sang, a lonely, cheerful twitter. "The Sand God is tired," Sybtl said. "He is not angry now. I'm glad. Perhaps he will let you stay." "No. Even if he allowed it, I couldn't stay. My people could never live of creeping, crawling nether things. The bird's twitter stopped abruptly. "Earthman," the Sand God said, as if he were about to make a statement. Stinson ignored him. He glanced down at Sybtl, who sensed that this was a time for good-bys. He thought, perhaps I can stay here alone with her. The webfoots might find us, or the Sand God might destroy us in one of his fits, but it might be worth it. "Don't go," she said. "Not yet."

<question>:
Why does the Sand God keep the webfoots around?

<options>:
A It amuses the Sand God to watch the webfoots evolution.
B It amuses the Sand God to play with the webfoots.
C The webfoots worship him like a God even though he is not one.
D The webfoots fear of the Sand God amuses him.

<answer>:

A