Answer: C. preposition: during; object of the preposition: thunderstorm
Prepositions are words that introduce facts or information to the reader. It can state where something takes place, when or why something takes place, or general descriptive information.
Object of the preposition is needed because a preposition don't stand on its own. Preposition and object of the preposition are grouped together as a prepositional phrase. This phrase begins with the preposition and ends with a noun which is the object of preposition.
In the above sentence, the prepositional phrase is:
during the loud thunderstorm.
"during" is the preposition because it gives information on when something takes place
"thunderstorm" is the object of preposition because it is the noun in the prepositional phrase.
