Answer:
Mr. Underhill asked the students to present THEIR science fair project.
Step-by-step explanation:
An incorrect pronoun shift occurs when a writer or speaker shifts the pronoun from one person to another, thereby changing the narrative or meaning of the sentence.
Therefore, from the given sentence, the incorrect pronoun shift occurs when Mr
Underhill uses "our" instead of "their" type of pronoun when talking about a group of people.