<p>Farmers in California are overwhelmed by the enormous demand for <u>their</u> organic potato products.</p><div data-answer="d">(A) they - Incorrect. "They" is a pronoun used to refer to people, not possessive pronoun for the farmers.</div><div data-answer="d">(B) themselves - Incorrect. "Themselves" is a reflexive pronoun used when the subject and object of a sentence are the same, but it does not make sense in this context.</div><div data-answer="d">(C) them - Incorrect. "Them" is an object pronoun used to refer to a group of people, but it does not indicate possession.</div><div data-answer="d">(D) their - Correct. "Their" is a possessive pronoun used to indicate that the organic potato products belong to the farmers in California.</div>