The Two Blocks in the Figure Have Masses M₁ and M₂

Multiple Choice

The two blocks in the figure have masses M₁ and M₂ such that M₁ < M₂ and they lay on a level,frictionless surface.We can apply a horizontal force F either from the left or from the right,as depicted in the figure.The contact force between masses M₁ and M₂ is

A) the same in either case.
B) larger when F is applied from the left.
C) larger when F is applied from the right.
D) zero newtons.
E) impossible to determine based on this data.