Answer:
11 inches by 11 inches
Explanation:
I think your question is missed of key information, allow me to add in and hope it will fit the original one. 
Please have a look at the attached photo. 
My answer: 
Given the information: 
- The area of the reduced photo is 64 square inches
 - The equation 
= 64 where x is the the side measure of the original photo. 
Let us solve for x by taking positive square root of both sides.\

<=> x = 11 
So the dimensions of the original photo is 11 inches by 11 inches
We choose A
Hope it will find you well.