The underlined phrase in the sentence is an infinitive phrase. Hence, Option B is correct.
What is an infinitive phrase?
A phrase is a group of words consisting of an infinitive, a modifier, or the use of pronouns, direct objects, indirect objects, or complements of action or state expressed in the infinitive.
It usually begins with the word "to" and is followed by the base form of a verb. Some of the examples of the infinitive phrase are: to read; to run; to jump; to play; and many more.
An image is attached at the end for better understanding.
Therefore, Option B is correct.
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