How did the people at Mission control feel as Eagle was landing on the moon?​

They felt nervous and excited

Explanation:

since it is asking for her reaction to elnora's trouble at school you can rule out any answers with a positive response (b). then you can rule out (d), this is because it does not show the mother's reaction but the daughter's response. that leaves you with two options (a) and (c), by looking at the options you can rule out (c) because it isn't referring back to elnora's issues at school.

not concrete, existing in thought or as an idea but not having a physical or concrete existence