your parents would like to know ----- you've been up to by n

your parents would like to know ----- you've been up to by now,so you'd better write them a letter.
A.which
B.why
C.what
D.that
(翻译一下这句话)
Is,it,in your opinion,likely------ new measures will be taken to control the high housing price?
A.whether
B.when
C.what
D.that