<p><span style="font-size: 13.008px;">The correct answer is </span><strong style="font-size: 13.008px;">(C) turns</strong><span style="font-size: 13.008px;">.</span></p>
<p>In this sentence, we are looking for a verb that describes what happens to the product. The phrase "just a passing fad" implies that the product is not popular or successful in the long term. The verb that best fits this meaning is "turns."</p>
<p>Option (A) "goes" does not fit because it does not accurately convey the idea of the product's popularity or success. </p><p>Option (B) "works" does not fit because it implies that the product is successful, which contradicts the idea of it being a passing fad. </p><p>Option (D) "keeps" does not fit because it does not convey any specific outcome for the product.</p>