Identify the pronoun: People who live healthily remain happy.

When the name of a person or an object has been mentioned earlier, we use pronouns to refer to them again in place of the nouns. There are a total of eight kinds of pronouns in English grammar.  Personal pronouns are used as substitutes for the names of a person or an object. Reflexive pronouns are used when the subject and object of a verb are the same. Emphatic pronouns are used as reflexive pronouns specifically used for emphasis. Pronouns used to refer to a noun used earlier in the sentence are called relative pronouns. So, option B is the correct option.