"my aspiration to become a famous astronomer propels me to exceed in all of my classes."

identify the positive or the appositive phrase.
a)to exceed
b)aspiration
c)to become a famous astronomer
d)classes

An appositive is a noun (it can also be a noun phrase, depending on its complexity) that adds information to a preceding noun by renaming it. C is the best answer, although this is a verb phrase rather than a noun phrase. ‘To become a famous astronomer’ renames ‘my aspiration’.