Final answer:
The correct sentence is "The pack of wolves returned to its den," as 'its' properly matches the singular form of 'pack' and correctly conveys possession. Therefore correct option is D
Step-by-step explanation:
Emily identified a pronoun error in the sentence "The pack of wolves returned to their den." The confusion lies in the fact that "pack" is a singular noun, referring to a group as a whole, whereas "their" is a plural possessive pronoun, typically used to refer to multiple individuals or things. In this case, the correct pronoun must match the singular form of the subject "pack" and should convey possession.
The correct sentence is: "The pack of wolves returned to its den." This correction uses "its" which is a singular possessive pronoun that refers to something belonging to a non-human entity or group, such as a pack of wolves.