Can anyone help me and explain why the answer chose is what it is?

I am genuinely so lost when it comes to this section, and I don't really want to move on until I am sure I have a better grasp. Can anyone help me when it comes to what these questions are even asking? I know it is a weakening question, but how do I differentiate a causation question from a basic weakening question. And once I figure out it is a causation question, how do I go about solving it????

#help

Sometimes I see like 10 quizzes back to back on the same topic in the curriculum. Once I believe I understand it, should I still be doing the quizzes, or skip over some and not do all of them... What worked for everyone else on here?