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Hello
GMATNinjaThank you for the answer brief. However, I still find it hard to understand what the author means when he says:
they are empowered to question its quality. Doesn't he mean that
if a person knows the service, s/he questions (Doubts) the quality? Even though it wouldn't make sense for people to doubt the quality if they are certain of the service quality but still as I was reading I understood this meaning.
Let's take a close look at the line you mentioned:
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Moreover, since customers understand a restaurant’s product and know what to anticipate in terms of service, they are empowered to question its quality.
If someone is "empowered to question" something's quality, this tells us they have the
power to question its quality. In other words, they are
able to question its quality.
So why would customers be "empowered" to question a restaurant's quality? According to the author, it's because they "UNDERSTAND a restaurant's product and know what to anticipate in terms of service." In short, since customers understand basically how a restaurant works, they can judge the quality of its service.
According to the author, all of this is "not generally true in the case of skilled activities such as electrical work." Because for things like electrical work, customers probably do not "know what to anticipate in terms of service." Put another way -- at restaurants, people know what good service looks like, so they can judge its quality. For more skilled things like electrical work, customers are less knowledgeable, so they're less able to judge the quality of service.
By why is the author discussing all this? What conclusion does s/he draw? Notice this discussion ends with the statement that in cases like electrical work, "a guarantee might have greater customer appeal." This is in contrast to restaurants, where a service guarantee "could actually have a negative effect."
Let's take another look at (C):
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C. Such guarantees are likely to have less appeal in situations where customers are knowledgeable about a business’s product or service.
Recall the author's conclusion from the preceding discussion -- in situations where customers "know what to anticipate in terms of service" (such as restaurants), service guarantees could have a negative affect. But in situations like electrical work, where they don't know what to anticipate, "a guarantee might have greater customer appeal."
This conclusion lines up nicely with the idea that "guarantees are likely to have less appeal" when "customers are knowledgeable about a business’s product or service." Since we can infer the author would agree with (C), it's correct.
I hope that helps!