a) I friended you because you are the Doctor's daughter! I figured it you're half as wonderful as he, we'd get along very well.
b) Does it have to be an object? Because I associate you with questions. You always have good ones.
c) You are a lovely person and you smile a lot.
d) The conversation we had about Jay.
e) What's the name of your race? And what planet are they from? (Okay, that's two questions, but no harm, yeah?)
f)