Four of the following five parts numbered (a), (b), (c), (d) and (e) are exactly equal. The number of the part which is not equal to the other four parts is your answer.  Choose the correct choice from the following choices:	A) 2x2 – 3xy + y2	B) (2x + y)(x – y)	C) (x – y)2 + x(x – y)	D) (2x – y)2 – x(2x – y)	E) (2x – y)2 – 2x2 + xy
Other parts are equal to   2x2 + y2 – 3xy.   Answer (2x + y)(x – y)
<result>B</result>
Four of the following five parts numbered (a), (b), (c), (d) and (e) are exactly equal. The number of the part which is not equal to the other four parts is your answer.