The correct option will be : D) in order to find out how much she paid per apple.
Explanation
Suppose, the price of each apple is
dollar.
So, the price of 7 apples will be :
dollar.
Given that, Molli purchased 7 apples for $3.96 , this means.....

Here we can see that if we divide 3.96 by 7 , then we will get 'x' which is the price of each apple.
So, Molli perform that calculation D) in order to find out how much she paid per apple.