Question

what is the purpose of comparison shopping?
ensuring you are not buying out of emotion
attempting to find the best deal on a product
determining whether you truly need a product
reading reviews to make sure a product is good

Explanation:

Comparison - shopping is mainly about looking at different sellers or offers for a product to get the most favorable price or terms. It helps consumers find the best deal. While the other options may be related to making a good purchase decision, they are not the main purpose of comparison - shopping.

Answer:

attempting to find the best deal on a product