My math teacher doesn't mind what way I solve the problem __

My math teacher doesn't mind what way I solve the problem _______ I can.
My math teacher doesn’t mind what way I solve the problem­­­ _______ I can.
A.even though B.as soon as C.as long as D.as though
It is none of your business __________ other people think of you.Believe in yourself.
A.How
B.What
C.Which
D.When