obstruction/interference

[ggk]

NCAA rules.
another question from eofficials.com where the answer doesn't seem quite right.
thoughts? would your answer differ for fed or obr? thanks.

Question:

R2, no outs. Line drive back at the pitcher that deflects off the pitcher’s knee and bounces over towards first base, near the foul line, but remains in fair territory. As the first-baseman is fielding the ball, the batter-runner runs over the defensive player.

Answer:

A. The batter-runner is out for interference.
B. No interference.
C. The fielder is protected in this instance.
D. Eject the batter-runner because he caused the collision.
E. Obstruction. If the batter is out, the out is cancelled and he is awarded first.
F. A and C