Answer :
From the above options, the sentence that actually contains a pronoun with a vague or ambiguous antecedent is: When Alicia picked up her sister, she was tired.
What is pronoun antecedent?
Pronoun antecedent actually refers to the word that a pronoun is referring to in a sentence. Pronouns should refer to their antecedents clearly. But when pronouns are not able to give a clear antecedent, it becomes ambiguous.
We see that in the sentence selected above, the pronoun has a vague or ambiguous antecedent. There are two pronouns and the last pronoun (she) is unclear who is being referred to (Alicia or her sister).
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