Am I the only one who think it is more similar to a sufficient assumption ?

I am also a foreign language test taker. Your story is exactly what happened to me on July’s test. After July i start to focus on LG, not the easy ones but the brutal games. You can google the hardest LG for practice. I collected these games and created a problem set and try to finish each game in 9min. Hope this will be helpful!

Why AC E seems more like a sufficient condition to me. #help

This is a really time-consuming question. Even though I an figure out all the structures, there is still no way to do this question faster because I have to go through every single answer choice.

I draw the structure correctly but couldn’t find it is a correlation causation confusing flaw......

#help i am really confused for answer choice E,WHy is E a necessary assumption ?

I eliminated choice bcde but I still don’t understand why A is correct until I figure out that autoimmune and viral-infection are two different system. I feel that it requires some knowledge about biology and it has already beyond common sense to me.