Answer: B
Step-by-step explanation:
An infinitive is a verb form that usually begins with "to." It is called an infinitive because it is not limited by person or tense, and it functions as a noun, adjective, or adverb in a sentence. For example, "to run" is an infinitive, and it can be used as a noun, as in "To run is good exercise," as an adjective, as in "I have a lot of work to do," or as an adverb, as in "She came to dance." The "to" at the beginning of the infinitive is called the infinitive marker, and it is used to distinguish the infinitive from other verb forms, such as gerunds or participles.