My one qualm with this question was answer choice E. The video discounted this choice fairly quickly but I think it had some legs. The fact that the movement was not corrected does not show you anything conclusive about whether the visual system was actually utilized or not, which is why I think E could be possible. I had to work with the actual experiment this prompt is about in a class, so maybe I am just infusing too much of my own prior experience into an otherwise "more simple" question.

PS in the actual experiment the vision corrected back but sound did not smh

I would love more drills, having only one for a 32 part section seems short. I would love like 3 questions to really test whether one is able to understand this consistently rather than a one-off (could be chance) scenario.

Not exactly, the contrapositive here stipulates that if the market is not crashing, we know for a fact that a zombie attack is not occurring. This is because a market crash is a necessary consequence to a zombie attack. Hope this helps!