A

Step 1: Identify the forces acting on mass B due to A. The forces acting here include the gravitational force (mg, acting downwards) and the frictional force between A and B.
Step 2: Since A and B are in contact with a rough surface, friction will act to oppose the relative motion between them. If A is being pushed to the right, B will tend to move to the left due to inertia.
Step 3: To maintain equilibrium for mass B, friction must act up the incline opposite to the direction of A's movement, meaning that the frictional force on B due to A will be directed upwards.
Step 4: Since there are no vertical forces other than weight acting on B and friction, we can conclude that for B to be in equilibrium under these conditions, the friction on B must be upward.
Therefore, the answer is A.