Yes, it is an equivalent expression because even though you move two pieces of an equation it will still equal the same thing, unless there are parentheses involved.
I would say the answer is c
Answer:
61
Step-by-step explanation:

If 1 pint equals 2 cups then you would have 10 cups for 5pints.... 5 pints is the answer
So this is going to be using proportions, which in this case is going to be 
Firstly, cross-multiply to get 
Next, just divide 18 on both sides, and your answer will be
, or the last option.