I'm confused as to how D is correct. For another question, the rationale was not to confuse "no-evidence" as evidence, ie just because there is no evidence of something does not mean that it is less likely to be true...

@Benjaminrobert Thank you!!!

Do you always watch the videos even if your answers are right?

Do you think it's worth spending time making flashcards for the three groups or just continue on? I'm trying to understand how best to balance study time on these lessons vs doing drills.