Which of the following is true about pronouns?

The statement that pronouns are used in place of nouns is accurate. Pronouns serve the specific purpose of substituting for nouns to avoid repetition and to create fluidity in sentences. For instance, instead of saying "Jane went to Jane's car," a pronoun can be used: "Jane went to her car." This substitution makes writing and speaking more cohesive and helps maintain clarity in communication.

The other options do not accurately describe the function of pronouns. Pronouns do not replace adjectives, are not inherently plural, and do not denote action—those functions are better suited for verbs. Understanding the role of pronouns in language is fundamental for effective business writing, as it enhances clarity and keeps the reader engaged.