Determine whether the underlined sentence opener in the sentence below begins with an adjective, adverb, infinitive, or prepositional phrase.
To satisfy his hunger, the giraffe munched on the trees.

Please select the best answer from the choices provided.
A.
adjective
B.
adverb
C.
infinitive
D.
prepositional phrase


Please select the best answer from the choices provided

A
B
C
D