I think the answer would be insecurity as he feels inferior to his peers in a specific area. He feels ashamed/embarrassed that he may not be as smart.
Are we supposed to answer this if we are then I would reach out my dog because he help depression xd
Indeed, C and B both are correct, however, A is also correct as your circulatory system will be mostly affected due to lower oxygen levels. Due to these, there will also be less oxygen which can be caried around in your bloodstream.
