The answer would be D. It has a verb, but no subject.
They can't work/function on their own... and they're short. Hope this helps!
I don’t remember I think I did read something like this so the answer is b
A time that I often use acronyms is PEMDAS for math. PEMDAS stands for Parentheses Exponents Multiply Divide Add Subtract. This particular acronym is used for simplifying expressions with 2 or more operations. This was a very useful technique because it really stuck in the brain and helped me remember which order to simplify the expression.
Hope this helps :)