C. rhetorical
Explanation:
A rhetorical question is a question (such as "How could I be so stupid?") that's asked merely for effect with no answer expected. The answer may be obvious or immediately provided by the questioner.
They would be the first birds to fly there.
Preferably not. unless you are doing research on how brains work in the same way your results could be completely different from a depressed moose to a depressed squirrel to a depressed human