ya im so confused that this was considered a difficult question. I genuinely thought it was extremely easy while other that were ranked as easier I found to be more difficult! So confused

I also thought B was wrong because it says it doesn't change their behavior and communicating is a behavior.

ya I think im confused of when we would need to negate and when we would need to find the contrapositive

Are we sure that some csn mean all? I thought some is a portion of a whole.

exactly

For #1- why aren't we making what we are negating the necessary condition if cannot belongs in group 4