The correct statement about the Proof of the Pythagorean Theorem is:
"To make a right triangle in the center, the area of the smaller two squares must add to equal the area of the largest square."
This captures the essence of the Pythagorean theorem, which states that in a right triangle, the square of the length of the hypotenuse (the largest side) is equal to the sum of the squares of the lengths of the other two sides (the smaller sides).