From the sum of 2y^2 + 3yz, - y^2 - yz – z^2 and yz + 2z^2, subtract the sum of 3y^2 – z^2 and – y^2 + yz + z^2.

Question

( A ) -y^2 - 2yz - z^2
( B ) -y^2 - 2yz + z^2
( C ) -y^2 + 2yz + z^2
( D ) y^2 + 2yz + z^2