PT22.S2.Q19 - Professor: A large meteorite impact crater

I don’t think I understand the fundamental argument here... Initially I hesitantly chose A (the correct answer) thinking - the professor disputes the crater causing the extinction, this is irrelevant. However, during my review, I switched to E thinking he is arguing that, in spite of the common belief, because the rocks are normal polarity, the impact happened after the Mesozoic era when earth’s polarity was flipped. Therefore, the size of impact leads people astray, the rocks were caused by, melted, and recrystallized soon after the impact, but the mass extinction didn’t happen shortly after the impact, but rather much earlier.

This is the wrong answer, so I’m trying to determine where my thinking went wrong.... Thanks!

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