I'm not sure if A B C D are answers, but I can say for sure that C is positive and A, B, and D are negative.
A:

Since there is only one -1, the expression is negative;

B:

Here as well, there is only one -1, so the expression is negative;

C:

The -1 cancels out;

D:

Here, you can't cancel the -1 out, so it remains negative;

Sorry for the delay, hope this helps :)