Explanation
Correct answer: C.
Choice C is the best answer because it presents the best description of the overall structure of the text. The text begins by stating that companies are increasingly giving consumers opportunities to customize products, allowing them to make design choices when buying certain sneakers, jewelry, and clothing. The text then indicates that although this trend benefits companies because they can successfully charge buyers more for customized products and don’t have to rush production, it also poses a challenge because producing unique items may require different and more expensive methods than the ones typically used for mass production, raising the companies’ costs. Thus, the text first introduces a trend in consumer products and then explains how the trend both benefits and poses a challenge to companies.
Why the other choices are wrong
Choice A
Choice A is incorrect because the text doesn’t present the customization of various products as a recent innovation—the fact that there are "more opportunities" now indicates that there were opportunities before—and no other innovations, in product manufacturing or otherwise, are discussed.
Choice B
Choice B is incorrect because the text doesn’t discuss any particular company or example and instead speaks broadly about the trend of companies providing customizable products.
Choice D
Choice D is incorrect. Although the text discusses companies offering something that consumers like and are willing to pay more for—the ability to customize products—it doesn’t characterize this as a product-marketing technique and doesn’t compare it to any other kind of offering or technique.