Consider the question. Four of the five parts numbered (a), (b), (c), (d) and (e) in the following equation are exactly equal. Which part is not equal to the other four ? The number of that part is the answer.
Options:
(A) (x + 2y) (3x + 2y) 
(B) (x + 2y) 2 + 2x(x + 2y) 
(C) (3x + 2y) 2 – 2x(3x + 2y) 
(D) 3x(x + 2y)  + 2y(x + 2y) 
(E) x(3x + 2y)  – 2y(3x – 2y) 
 What is the step-by-step reasoning process to arrive at the answer: (E)?
user
Others are equal to 3x2 + 8xy + 4y2
assistant