I have messed up on that, and I need to study, so can someone please answer me and then I can study that

i think it might be carbon dioxide, but sorry if i'm wrong

Explanation:

this website is for anybody really not just for girls just saying, also while a lot of males are mean and you know there are the few who are kind and then there's the nice-guys but then theirs also guys like me who are shy we don't get out much because there are people like you who exist who would most likely punch a guy in the face so next time just think about things before you post them to a website where guys and girls can see your question.

i think that it is c, d, and e, hope this