Answer:
Option A is correct
11 inches by 11 inches
Explanation:
Area of square (A) is given by:

As per the statement:
Miriam reduced a square photo by cutting 3 inches away from the length and the width so it will fit in her photo album.
The area of the reduced photo is 64 square inches.
Given the equation:
where, x is the the side measure of the original photo.
Solve for x;
Take square root both sides we have;

⇒
Add 3 to both sides we have;
x-3+3 = 8+3
⇒x = 11 inches
Therefore, the dimensions of the original photo were : 11 inches by 11 inches