Respuesta :
"''Breathing'' is the word in the sentence "''Breathing'' is a basic function controlled by the brain" that is a gerund. The correct option among all the options that are given in the question is the second option or option "B". I hope that this answer has come to your great help.
The answer to your question would be that the sentence in which the underlined word is a gerund is the following one: "Breathing" is a basic function controlled by the brain. That is, the correct option would be B.
Gerunds are words that are formed with verbs but act as nouns. Â Therefore, they can function as subjects, subject complements, or objects in the sentence. In the sentence in question, the gerund "breathing" is functioning as the subject.