Answer:The unclear pronoun in the given sentence is "they" in option A.
In option A, the sentence states: "Paul and Kelly left their dogs at the kennel, but then they worried that their dogs would be homesick." The pronoun "they" is unclear because it is not clear who "they" refers to. Is it Paul and Kelly, or is it their dogs?
To make the sentence clearer, we can revise it by specifying who "they" refers to. For example, we can say: "Paul and Kelly left their dogs at the kennel, but then Paul and Kelly worried that their dogs would be homesick."
By adding the names "Paul and Kelly" instead of using the pronoun "they," we remove the ambiguity and make the sentence more precise.
It is important to use clear and specific pronouns to avoid confusion and ensure that the meaning of the sentence is understood by the reader.
Explanation: