Explanation:

Noun and Types of Nouns:
A noun is a word that names a person, place, thing, or idea. There are several types of nouns, including common nouns, proper nouns, concrete nouns, abstract nouns, countable nouns, and uncountable nouns.

Explanation of the answer:
In the given sentence, "factory" is used to describe the place where the speaker's father works. Therefore, "factory" is a noun that refers to a place where goods are manufactured or assembled by workers. Since it is a noun that names a place, "factory" is a common noun.

Options:
A) Pronoun: A pronoun is a word that takes the place of a noun in a sentence. For example, "he," "she," "it," "they," or "we" are pronouns. Since "factory" is not replacing any noun in the sentence, option A is incorrect.

B) Noun: As explained above, "factory" is a noun that refers to a place where goods are manufactured or assembled by workers. Therefore, option B is the correct answer.

C) Adjective: An adjective is a word that describes a noun or a pronoun. For example, "big," "small," "red," or "green" are adjectives. Since "factory" is not describing any noun in the sentence, option C is incorrect.

Conclusion:
The correct answer to the given question is option B, which states that "factory" is a noun.