Explanation:

- The sentence is: "They are all going to attend the function."

- The word "They" is underlined, and you are asked to identify its part of speech.

- Option 1: Noun

- Nouns represent people, places, things, or ideas. Example: "cat," "city."

- Option 2: Adverb

- Adverbs modify verbs, adjectives, or other adverbs. Example: "quickly," "very."

- ? Option 3: Pronoun

- Pronouns replace nouns in a sentence. Example: "he," "she," "they."

- Option 4: Conjunction

- Conjunctions connect words, phrases, or clauses. Example: "and," "but."

- Correct answer: Option 3: Pronoun. "They" is a pronoun replacing a noun for a group of people.