question:  Why did Mia begin to feel defeated and tired?
context: The ancient rule was sink or swim—swim in the miasma of a planet without spaceflight, or sink to utter destruction! I The horses and packs were loaded before we went aboard the scoutship. My name is Mia Havero. The last contact the Ship had had with it—and we were the ones who dropped them—was almost 150 years ago. The thought that made me unhappy was that I would have to be on a planet for a whole month. 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. We have a place in the Ship like that—the Third Level—but it's only a thousand square miles and any time it gets on your nerves you can go up a level or down a level and be back in civilization. They don't let us grow for fourteen years and then kick us out to die. 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. The ship lifted impersonally away from Ninc and me like a rising bird, and in just a moment it was gone. When the sun disappears, somehow you wonder in your stomach if it's really going to come back. And I've seen things that looked good that I couldn't keep on my stomach. One of the smartest moves in history was to include horses when they dropped the colonies. 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. One of the eight, as well as the two that were being built then, went up with everything else in the Solar System in 2041. 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 much water makes me nervous, and roads have to go somewhere.
output:  She didn't understand the planet she was dropped in
options:  She was out of food  She'd been riding for over a week  She missed her family  She didn't understand the planet she was dropped in