Areflexive pronoun is a pronoun

formed with -self or -selves that is used for emphasis.
formed with -self or -selves that refers to the subject.
that is not formed with -self or -selves.
that is not plural or possessive.

The correct answer is B. Formed with -self or -selves that refers to the subject

Explanation:

A reflexive pronoun is a pronoun that derives from the ordinary pronouns (I, you, he, she, etc) and it is used to refer to a previous pronoun in a sentence, also, reflexive pronouns in English end in -self or -selves, for example, myself, himself or themselves, finally this type of pronouns usually refer to a pronoun that is before the reflexive pronoun and depends on it for example in the sentence "I cook the dinner myself"  the reflexive pronoun "myself" refers to the subject or pronoun "I". Thus, a reflexive pronoun is one formed with -self or -selves that refers to a previous subject or pronoun.