I like the idea, but it needs some polish. In my line of work, I've heard of people using kahoot but not me personally, so I don't know how much flexibility there is to fix all of these things, but a few suggestions if possible:
a) Can you have more control over the video? I had to wait for a replay to verify the spot of the foul, which cost me precious pretend internet points.
b) The options threw a curveball which is why I wanted to rewind the video -- the fouls on A were listed in just one option, which makes it seem like the correct answer, but the resulting spot was the spot of the foul, not after penalty enforcement. The option with the correct enforcement yardage didn't have the fouls listed.
c) Is it possible to set up Page 1 where you watch the video, then Page 2 to answer the question? I found myself trying to evaluate the options while the video was going and therefore effectively looking at neither of them. If I know what the options are, I'll pay more attention to that segment of the play -- I'm not considering an illegal formation if all the options are about KCI, for example. In that situation, I'm also hyperfocused on the end of the kick, which makes it a little unrealistic for a true game scenario where I'm trying to keep focus on several aspects of the play.
d) A general question idea -- have "boring" plays and then ask questions about "mundane" details. Simple running play up the middle, then ask who the eligible receivers were, or who the back judge was keying on, or the number of a player making a block. What do you do pre-snap every play and then drill those to make it all second nature -- then when something going "wrong" it's easier to get a fix on the who/what/when/where.