Is a word that takes the place of one or more nouns. An adverb A pronoun An article A preposition?

The correct answer is a pronoun.

A pronoun is a Word that takes the place of one or more nouns in a sentence.

Examples:

I bought some lilacs for mother. They are her favorite flower.

• the pronoun 'they' takes the place of the noun 'lilacs'.

I bought some lilacs for mother. They are her favorite flower.

• the pronoun 'her' takes the place of the noun 'mother'.