Three Blocks, Connecting Ropes, and a Light Frictionless Pulley Comprise

Multiple Choice

Three blocks, connecting ropes, and a light frictionless pulley comprise a system, as shown. An external force P is applied downward on block A. The system accelerates at the rate of 2.5 m/s². The tension in the rope connecting block B and block C equals 60 N.
-In the figure above,the external force P is closest to:

A) 170 N
B) 190 N
C) 210 N
D) 230 N
E) 250 N