The answer is not A, because it is not clear enough. Who's we?
The answer is not B, the sentence is not clear about the building they are visiting.
The answer is not C, it's not clear about what building they are talking about.
So your answer is D.
" I"
"I got a flat tire" is the main clause, and "i" is the subject.
Is there more to this question?
The answer is D, because in all other choices it doesn’t address how she’d like others to address her disability.