'So, if the hypothesis is that A caused B, then it must be the case that A occurred before B. That's conditional logic. Quick, what's the contrapositive? If phenomena A did not precede B, then A cannot be the cause of B.'

Don't contrapositives follow the form:

A --> B

/B --> /A

How does the contrapositive here work? Am I missing something?

Let's see what the hype is all about.

I spent two minutes on this question.

I'm not sure I like this question... the subject matter is too common knowledge to really work as RRE.

2/5 on hardest difficulty, went through each incorrect and figured out where my logic was erring, then 5/5 on hardest difficulty.