This really helps, I got very locked into the mindset that because there was an assumption being made there I couldn't pick the answer. However, if I keep in mind that there are certain answer choices that will force me to reasonably make an implicit assumption, I think I'll do better. Thank you for this comment!

I agree, definitely tripped me up for a few minutes after I finished the question trying to better understand why B was wrong. Reading the explanation after the video helped a ton but phew it's making me work my brain haha.