Choice D is the best answer. The fifth paragraph details the results of the fourth experiment of Wegner's study, where participants were more likely to recall digital folder locations where statements they typed were saved than the actual statements themselves. The first sentence of the last paragraph summarizes why this result may not be alarming: "And even though we may not be taxing our memories to recall distinct facts, we are still using them to consider where the facts are located and how to access them." In this sentence, the author paraphrases Wegner's view that although human memory is changing as a result of technology, this doesn't indicate that human memory is declining, as people are relying on their memory to access specific types of information. Therefore, this sentence best supports the idea that reliance on computers doesn't necessarily diminish human memory.
Choices A, B, and C are incorrect because the cited lines don't support the idea that reliance on computers doesn't necessarily diminish human memory. Instead, they introduce the topic of Wegner's research (choice A), provide examples of the types of information that people may now rely on the Internet to provide (choice B), and concede that the Internet may diminish critical thinking skills (choice C).