Answer: I would contend that the right answer is actually the D) Wavely Jong's behavior as a Chinese daughter was beyond reproach.
Explanation: Just to elaborate a little on the answer, it can be added that to reproach someone is to blame, discredit, or disapprove him or her (or his or her actions). In this sentence it is being said that the behaviour of Wavely Jong as a Chinese offspring could not be disapproved or discredited—far from that. The word has roots in the Portuguese and French languages.