Two Boxes P and Q on a Perfectly Smooth Horizontal $\overrightarrow { \mathrm { F } }$

Multiple Choice

Two boxes P and Q on a perfectly smooth horizontal surface are connected by a light horizontal cord.The mass of P is greater than that of Q.A horizontal force $\overrightarrow { \mathrm { F } }$ is exerted on box Q as shown in the figure,accelerating the bodies to the right.The magnitude of the force exerted by the connecting cord on body P is

A) zero.
B) less than F but not zero.
C) equal to F.
D) greater than F.