Read the sentence.

Much to the delight of the students, the faculty decided to enrich the curriculum by adding art to Tuesday mornings and music to Thursday afternoons.

Which part of the sentence contains an infinitive?

to enrich

to the delight

to Tuesday mornings

to Thursday afternoons

The answer is A "enrich"

An infinitive composes the words "to" plus the "simple verb". Infinitives can be used as nouns, adjectives or even adverbs. In the given sentence above, the part of the sentence that contains an infinitive is, "to enrich". The infinitive "to enrich" is used as an adverb in the sentence modifying the verb

"decided".