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

<passage>:
DOWN TO THE WORLDS OF MEN in the miasma of a planet without spaceflight, or sink to utter destruction! small ships squatting over their tubes, but it was the last of the Ship me. He's red-headed and has a face that makes him look about ten. An I guess he thought that because we were always matched on study I liked him. Well, I did when I wasn't mad at him, but now I had that crack back to his place without saying anything. My name is Mia Havero. I'm fourteen, of course, or I wouldn't be telling this. I'm short, dark and scrawny, though I don't expect that leave that way, but George thinks it's fun to be a hot pilot. crack about being a snob. The planet chosen for our Trial was called Tintera. The last contact the Ship had had with it—and we were the ones who dropped them—was kids because they never tell you anything about the place they're going to drop you. All I knew was the name. I wouldn't have known that much if Daddy weren't Chairman of the Council. wasn't in public. It wasn't the chance of not coming back that bothered me really, because I never believed that I wouldn't. The thought that made me unhappy was that I would have to be on a planet for a whole month. Planets make me feel wretched. a piece of fluff and break your neck. There are vegetables everywhere and little grubby things just looking for you imagination. Worst of all, planets stink. Every single one smells—I've been on enough to know that. A planet is all right for a Mud-eater, but We have a place in the Ship like that—the Third Level—but it's only a Jimmy—if he would get back alive. It's no game we play. When we turn fourteen, they drop us on the nearest colonized planet and come back one month later. That may sound Don't think I was helpless. I'm hell on wheels. They don't let us grow for fourteen years and then kick us out to die. They prepare us. They you're fourteen, you're too stupid, foolish or unlucky to be any use to the Ship. There's sense behind it. It means that everybody on the Ship is a person who can take care of himself if he has to. Daddy says that something has to be done in a closed society to keep the population from decaying mentally and physically, and this is it. And it helps to keep the population steady. I began to check my gear out—sonic pistol, pickup signal so I could be found at the end of the month, saddle and cinches, food and clothes. Venie Morlock has got a crush on Jimmy D., and when she saw me start have anything to do with Jimmy. I just couldn't stand to put off the the dark. When the sun disappears, somehow you wonder in your stomach they dropped the colonies. I say "they" because, while we did the Earth. Considering how short a time it was in which the colonies were had to be domesticated from scratch. That would have been stupid. I'll bet that half the colonies would have failed if they hadn't had horses. road. That much water makes me nervous, and roads have to go somewhere. were five men on horseback herding a bunch of the ugliest creatures made a wordless, chilling, lowing sound as they milled and plodded and he saw me and called to another who seemed to be the leader. That He said, "What be you doing out here, boy? Be you out of your head? "And where be you going?" He seemed exasperated. I have that effect sometimes. Even on Mother and Daddy, who should know better. better ride on from here with us. For protection." He had an odd way of twisting his sounds, almost as though he had a mouthful of mush. I wondered whether he were just an oddball or whether all. We mought as well throw him back again." expected, he shrugged and one of the other men laughed. I looked down at the plodding, unhappy creatures they were driving didn't want to be fried. "Shut up," I said, in as mean a voice as I could muster, and he did. It that the creatures still while one beat a dust-raising retreat down the road. I even convince myself that I'm hell on wheels. III great-grandmother brought from Earth. The thing is that inside it, The country leveled into a great rolling valley and the trees gave something. cold and sweaty and my head was spinning, and I wanted to kick Ninc to a gallop. I rode slowly in, looking all around, missing nothing. The town was all stone, wood and brick. Out of date. Out of time, really. There were I decided I'd not tell anybody different until I found what made the The first thing you learn in school is that if it weren't for idiot and criminal people like these, Earth would never have been destroyed. The evacuation would never have had to take place, and eight billion people wouldn't have died. There wouldn't have eight billion people. But, no. They bred and they spread and they devoured everything in their path like a cancer. They gobbled up all the resources that Earth had and crowded and shoved one another until the final war came. wouldn't be here. That may not scare you, but it scares me. What happened before, when people didn't use their heads and wound up blowing the Solar System apart, is something nobody should forget. The up with a sore head and an empty pocket. The best thing I could think One more enigma. Where was it from? Not here. Even if you know how, and I felt defeated and tired. Not much farther along the road, I came to The kids weren't to blame for their parents, but when one of them said About the time I finished eating, and before it grew dark, the old man around. There was singing for awhile, and then the father of the children tried to pack them off to bed. But they weren't ready to go, so the old man started telling them a story. In the old man's odd nice little girl, and to get rid of the kid, she sent her on a phony errand into the deep dark woods at nightfall. I could appreciate the dear dead mother. But, as it turned out, they were just enough to A voice there said, "I'll be damned if I'll take another day like this I should have known that they would have to pen the animals up for the night. I should have used my head. I hadn't and now it was time to take who'd made the joke about me being beneath the notice of a Losel. He I opened my mouth to scream—I have a good scream—but a rough smelly dragging me and dropped me in a heap. "Make any noise," he said, "and threatened to break my arm or my head. It left him a latitude of things with it." He said, "Look, boy. You may not know it, but you be in a lot of didn't like to see the point go unchallenged. It was unflattering. "The courts won't let you get away with this," I said. I'd passed a courthouse in the town with a carved motto over the doors: EQUAL JUSTICE UNDER THE LAW or TRUTH OUR SHIELD AND JUSTICE OUR SWORD or something stuffy like that. He laughed, not a phony, villian-type laugh, but a real laugh, so I knew I'd goofed. "Boy, boy. Don't talk about the courts. I be doing you a favor. I be taking what I can use of your gear, but I be letting you go. You go to court and they'll take everything and lock you up besides. I be leaving you your freedom." jacket. "Every time you open your mouth you shout that you be off one of the in jail in Forton." I was about to bring my gun out when up came Jack leading Ninc, with said in a voice far colder than mine could ever be, because it was natural and mine wasn't, "The piece be yours." Then he tromped on it until it cracked and fell apart. face and then nothing.

<question>:
What does the narrator say was the reason for Earth’s destruction?

<options>:
A Losels
B Over population
C Lack of horses
D Crime

<answer>:

B