Explanation:
Step 1: Find the correct options for (a)
The only correct choices for (a) is option A and B. Since there is only one negative sign in the given fraction, the other fractions must only have one also. Therefore, the correct options are A and B.
Step 2: Find the correct options for (b)
The only correct choices for (B) is option C and D. Since there is only one negative sign in the given fraction, the other fractions must only have one also. Therefore, the correct options are C and D.