Elan mock Ethic question available, question, obtained

Penny-wenny

Hello guys
I dont agree with elan’s answer.
To avoid plagarism an analyst must disclose
A. The sources of widely available public information
B. The sources of summarized resports of other analysts.
C. or both (A. and B.)
Correct answer is C
But in my opinion it should be just B. For example LIBOR rates..we dont need to disclose from where we obtained the rate or am I wrong here?
Thanks