GMAT Critical Reasoning (CR) | #Top150 CR: According to recent research, a blindfolded person

According to recent research, a blindfolded person whose nostrils have been pinched so that smelling is impossible will have great difficulty in differentiating a bite of an apple from a bite of a raw potato. This clearly demonstrates that taste buds are not the only sense organs involved in determining the taste of a piece of food.

Which of the following premises, is an assumption required by the argument?

a) All people agree that an apple and a potato differ in taste.
b) There are no other
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