Answer :
Since you are multiplying the amount by 5, you need to take 2.5 oz by 5 which = 12.5oz
In this case, the best way to do this is to divide the number f trail mix you want to make, by the amount you know you can make- so 5/1. Giving you 5. Therefore, you have to multiply 2.5 by 5, so you have the right amount of chocolate pieces.
The answer is D. 12.5 oz