After finally watching the video several times and having the answers right in front of me, I'm going with "D".
I think the NCAA is trying to see if we'll get hung up on the "out of the baseline" bit, but since the fielder doesn't have the ball we can't call that. That leaves "he must be tagged" as the only way the defense can get him out. That makes "D" correct for me. FWIW.
JJ
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