Which sentence contains a pronoun shift that makes the sentence grammatically incorrect?
a) too many people wish that they had made better choices in life.
b) my statistics teacher insists that a student should bring his or her textbook to every class.
c) the students knew that they all needed to do their homework if they wanted to attend his party.
d) many people enjoy eating sweets. however, they eventually realize you should eat a balanced diet.

The correct answer is D) Many people enjoy eating sweets. However, they eventually realize you should eat a balanced diet.

Explanation:

Pronoun shift is a common grammatically mistake that occurs when one sentence begins with a specific pronoun (she, he, it, we, they, I) and this pronoun is changed although the writer refers to the same person. This is considered as a mistake because it is recommended pronouns are consistent in a sentence.

Pronoun shift occurs in "Many people enjoy eating sweets. However, they eventually realize you should eat a balanced diet" because the main pronoun of the sentence "they" that replaces "many people" is changed to "you" in the section "you should eat a balanced diet" and this is incorrect because instead the writer you have used "they" in all the sentence.