Question

When you've carefully checked all the facts and your attitudes and still find that there's "just something" about your supervisor that's causing a problem in your relationship, you should suspect that
A. you're not carrying your own weight.
B. too much socializing is going on.
C. there's an imaginary risk.
D. there's a hidden attitude.

Answer 1

When you've carefully checked all the facts and your attitudes and still find that there's "just something" about your supervisor that's causing a problem
in your relationship, you should suspect that "D. there's a hidden attitude" since these attitudes have ways of making every day tasks more difficult. 

Answer 2

I believe the answer is: D. there's a hidden attitude.

The hidden attitude could be something that derived from negative intention but not directly shown due to legal implication that your supervisor might face.
Example of hidden attitude could include things such as racial prejudice, sexual intention, sexism, etc.