Fraudulent online reviews for products are easy and advantageous to make. So online reviews aren't trustworthy and you shouldn't rely solely on them for making purchases. In most cases , manufacturers could, at no cost to themselves, produce positive but fraudulent reviews anonymously. it is also simple for competitions to freely post fraudulent reviews of products from which they'd like to take market-share.
which of the following is a criticism of a premise in this (extended argument)?
a. You should rely on online reviews for making purchases. Online reviews are easy to access and free to view, so there's no drawback for checking them.
B. You should rely on online reviews for making purchases because it has been well established that people who do so are more likely to make better purchases
C. There is a cost to manufacturers to posting online reviews, if they are discovered to have done so then their reputation plummets, and consequently, so do their sales
D. Online reviews are not trustworthy because they can often be made by people who have never even used the item that they are reviewing.