He takes his turn and she takes ____.

This question tests the correct use of possessive pronouns. Possessive pronouns replace possessive nouns or noun phrases to show ownership or relationship without repeating the noun.

• Hers: This is the correct possessive pronoun. It stands alone and means "her turn." The structure "He takes his turn and she takes hers" is grammatically parallel and correct, indicating that she takes her own turn.
• Her: This is a possessive adjective and must be followed by a noun (e.g., "her turn"). It cannot stand alone in this context.
• Herself: This is a reflexive pronoun, used when the subject and object of a verb are the same (e.g., "She saw herself in the mirror"). It doesn't fit the possessive context here.
• Himself: This is also a reflexive pronoun, referring to a male subject, and is grammatically incorrect for "she."

Therefore, hers is the only option that correctly functions as a possessive pronoun in this sentence.