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

<passage>:
The ancient rule was sink or swim—swim in the miasma of a planet without spaceflight, or sink to utter destruction! [Transcriber's Note: This etext was produced from leave that way, but George thinks it's fun to be a hot pilot. 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 almost 150 years ago. No contact since. That had made the Council I said good-by to Mother and Daddy—a real emotional scene—but that 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. The gravity is always wrong, for one thing. Either your arches and calves ache or every time you step you think you're going to trip on a piece of fluff and break your neck. There are vegetables everywhere to crawl on. If you can think of anything creepier than that, you've got a real nasty 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 not for me. 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 like fun to you, but a lot of us never come back alive. 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 do figure, though, that if you can't keep yourself alive by the time 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 found at the end of the month, saddle and cinches, food and clothes. have anything to do with Jimmy. I just couldn't stand to put off the bad moment any longer. animals. I shot one small one and ate it. It turned out to taste pretty good, though not as good as a slice from Hambone No. 4, to my mind the of horses and both narrow and wide wheels. Other tracks I couldn't identify. One of the smartest moves in history was to include horses when they dropped the colonies. I say "they" because, while we did the actual dropping, the idea originated with the whole evac plan back on Earth. Considering how short a time it was in which the colonies were established, there was not time to set up industry, so they had to have draft animals. were planted. I don't know how many of those planets had animals that could have been substituted but, even if they had, they would have 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. We'd come in from the west over the ocean, so I traveled east on the road. That much water makes me nervous, and roads have to go somewhere. I came on my first travelers three hours later. I rounded a tree-lined bend, ducking an overhanging branch, and pulled Ninc to a stop. There were five men on horseback herding a bunch of the ugliest creatures alive. They were green and grotesque. They had squat bodies, long limbs and knobby bulges at their joints. They had square, flat animal masks for made a wordless, chilling, lowing sound as they milled and plodded men on horseback had guns in saddle boots. They looked as nervous as cats with kittens. One of them had a string of packhorses on a line and he saw me and called to another who seemed to be the leader. That one wheeled his black horse and rode back toward me. 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 The hard man said to the others, "This boy will be riding along with us to Forton for protection." I looked down at the plodding, unhappy creatures they were driving along and one looked back at me with dull, expressionless golden eyes. the green creatures, which surprised me since the ones I'd seen before hadn't seemed smart enough to count to one, let alone do any work. But it relieved me. I thought they might have been eating them or silently past. And I overtook a wagon driven by the oldest man I've a gallop. I decided I'd not tell anybody different until I found what made the clocks tick on this planet. But that wasn't what bothered me. It was the kids. My God! They four children. It was the most foul thing I've ever seen. It struck me then—these people were Free Birthers! I felt a wave of nausea and I closed my eyes until it passed. 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 been 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. I am lucky. My great-great-grandparents were among those who had enough foresight to see what was coming. If it hadn't been for them and some others like them, there wouldn't be any humans left anywhere. And I 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 older people don't let us forget. But these people had, and that the Council should know. For one thing, people can't be depended on to talk about the things you up with a sore head and an empty pocket. The best thing I could think of was to find a library, but that might be a job. I'd had two bad shocks on this day, but they weren't the last. In the idiot stutter-fingered stupidity at the controls. As it skidded by me overhead, I got a good look at it and knew that it wasn't one of ours. 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 so the old man started telling them a story. In the old man's odd couldn't see far into the dark. A voice there said, "I'll be damned if I'll take another day like this one, Horst. We should have been here hours ago. It be your fault we're what they used the high-walled pen for. 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 leave. I brought the saddle around as hard as I could and then up, and he went down. He started to get up again, so I dropped the saddle on him That was a silly way to put it, but somehow it said more than if he'd The one I'd dropped the saddle on came up then. The others were putting the animals in the pen. He started to kick me, but Horst stopped him. "No," he said. "Look through the kid's gear, bring the horse and what trouble. So don't give me a hard time." jacket. said in a voice far colder than mine could ever be, because it was

<question>:
What does the narrator say is significant about horses?

<options>:
A Horses are a nuisance and make it hard for both colonists and scouts to get their jobs done.
B Horses make it easy for criminals to conduct their business planet to planet .
C Horses are the reason for the colonies’ success.
D Horses are the reason for the catastrophe suffered on Earth.

<answer>:

C