Answer: The sentence that shows correct pronoun-antecedent agreement is "If a team member is unable to attend a practice, he or she must provide a doctor's note".
Explanation: The second sentence ("If a team member is unable to attend a practice, he or she must provide a doctor's note") shows correct pronoun-antecedent agreement because the noun contained in the conditional clause is singular ("a team member") as well as the pronouns in the main clause acting as the subject ("he" and "she"). In contrast, the other sentences do not correct the error in pronoun-antecedent agreement as the pronoun that should have been included is "their" in the case of sentences 1 and 4 and "they" in the case of sentence 3.