A uniform rod of the material of Young's modulus Y is pushed over a smooth horizontal surface by a constant horizontal force F. The area of cross section of the rod is A. The compressional strain in the rod is

A

$$\frac{F}{AY}$$

B

$$\frac{F}{2AY}$$

C

$$\frac{3F}{2AY}$$

D

$$\frac{2F}{AY}$$