A 10-kg block is being pushed against a vertical wall by a horizontal force of 100N as shown in the figure. The coefficent of static friction,μ_s, between the block and the wall is 0.60; and the coefficent of kinetic friction,μ_k,is 0.40.

Which one of the following statements is true if the block is initially at rest?:

A. The total force exerted on the block by the wall is horizontally directed

B. The block will slide down because the force of static friction can be no larger than 60 N.

C. The block will remain at rest because the coefficient of static friction is greater than the coefficient of kinetic friction

D. The block will slide down the wall because the coefficient of kinetic friction is less than the coefficient of static friction