Which sentence uses punctuation correctly?
a. one of my teachers mrs. suazo has run two marathons.
b. one of my teachers mrs. suazo, has run two marathons.
c. one of my teachers, mrs. suazo, has run two marathons.
d. one of my teachers, mrs. suazo has run two marathons.

basic principle: a pronoun usually refers to something earlier in the text (its antecedent) and must agree in number — singular/plural — with the thing to which it refers. the indefinite pronouns anyone, anybody, everyone, everybody, someone, somebody, no one, and nobody are always singular.

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