Answer:
D, 25 x 40.
Explanation:
Formula: Length Times Width and the answer is Squared.
B is incorrect because you cannot add in the Formula of Area.
A is incorrect, when you look at the formula, it states putting square at the End of your Problem.
C is incorrect because you cannot add when you have to (Multiply) L and W.
D is correct because it shows Length times Width being multiplied together.
Hope this helps.