(a) I would try to convince my friend that being a poor is not a crime nor a matter of laughter. Hence, he should not tease his classmate. Instead, he should take care of his dignity and self-respect.
(b) I would stop him/her to do that.
(c) I would advise my classmates to be friendly with one and all.
(d) I would not get involved in the joke and would proceed from their immediately.
(e) I would try to convince those boys that girls are in no way less efficient than their male counterparts. I would give examples of Kalpana Chawla and Sunita Williams who did what many men could not think of.
I do hear this a lot, so don't blame me for being wrong (even if I'm wrong). I would say this answer (d), because I think what D is saying is that they would mix a certain amount of colors to make "their color", (as an artist) so that is their "medium". Hope this helped!!