The following sentence has been split into four segments. Identify the segment that contains a grammatical error. Do you know why / a number of people / prefers to shop / online nowadays?

Explanation

The segment that contains a grammatical error is: prefers to shop Key Points Using 'prefer' in place of 'prefers' to make the sentence correct. The expression "a number of" is always followed by the pluralnoun and a plural verb. Do not be misled by the indefinite article "a" in that expression: the expression is always used to indicate more than one of something . Example - A number of houses were demolished so that the supermarket could be built. Thus, the plural verb 'prefer' will be used. Therefore the correct answer is option 3. Hence, the corrected sentence is:Do you know why a number of people preferto shop online nowadays?