I believe the answer is C. Both A and B.
It reveals that Janine is a very softspoken and very patient person and that she is a very good singer but she does not open up about it too much.
Answer:
No
Explanation:
The question said a "random" sample which means that she doesn't know if the curfew of the sample tells her father that other people's curfews are earlier (eg. 8 o'clock), thus persuading her father to change her curfew an hour earlier which is not good for her.
She should organize specific data telling here father that other people have curfews later than 9.
This is an adequate subject because there is no surplus of information or anything that can be removed.