A. Correct! To understand this effect, visualize the propeller rotating clockwise (from the point of view of the pilot) and swirling the air around the airplane and pushing it back. As that clockwise-rotating air reaches the tail, it passes under it without a problem, but strikes the vertical stabilizer from the left side on the way up. This yaws the plane to the left.
B. Gyroscopic precession occurs during pitch changes. Visualize where you would have to push on the propeller in order to raise the nose up -- you'd have to push on the bottom of the prop disk. The gyroscopic action then translates that 90 degrees clockwise, pushing on the left side of the disk (from the pilot's perspective), so the plane yaws to the right. Therefore, during entry into slow flight, gyroscopic precession results in a RIGHT-yawing tendecy, though it is likely to be not very noticeable if the nose is raised gradually.
C. Yes, asymmetric thrust (a.k.a. p-factor) is a major reason you have to step on the right rudder pedal in slow flight! If you look at the propeller blades, you'll see that they are not flat, but rather shaped like wings. So, just as wings, they have an angle of attack, an angle at which they "bite" the air and create a force -- it's just that this force (thrust) is directed forward, not up as is the case with wings. Well, when the PLANE is at a higher angle of attack, the two propeller blades have different angles of attack. The downgoing blade (on the right) "bites" into more air, producing more thrust than the upgoing blade on the left. This pulls the plane to the left.
D. When the propeller rotates clockwise, it causes the plane to rotate counterclockwise (much like when you push on a wall, the wall pushes you in the opposite direction). This causes a ROLL to the left, which the pilot corrects with a roll to the right, which, as we know from Exercise 9, produces adverse yaw to the left.