It's a form of research to look at products from different websites, but comparison means when you are comparing two things.
My answer would be B. Comparison
Studying products for similarities or differences is known as Comparison shopping. Option B. This is further explained below.
Generally, Comparison shopping is simply a typical technique in which buyers check the prices of various things from several stores before making a purchasing choice.
In conclusion, Comparison shopping is the process of examining things for similarities and differences.
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