Alice refrains from answering the question about who would pick it - since she thinks it's obvious, after all, more of a rethorical question than anything else. The train picks it, of course. Just like all of the other awful decisions it's made about the train.

No, rather than answering that question, there's something else that she's getting curious about because of what Rui is saying.

"Do you care that much about how you look?"

Look, it's not a judgemental question! Alice cares a lot too! She's just curious.