What is the primary function of adjectives in a sentence?

Adjectives primarily function to describe nouns, providing additional information about them such as qualities, quantities, and specifications. This descriptive role enhances the reader's or listener's understanding of the noun by giving context or detail that makes the information more vivid and specific. For example, in a phrase like "the red apple," the adjective "red" describes the noun "apple," informing us about its color and allowing us to form a clearer mental image.

In contrast, other roles mentioned do not accurately encompass the primary function of adjectives. Some options refer to aspects like action (verbs) or connecting clauses (conjunctions) which fall outside the descriptive capacity of adjectives. Additionally, replacing nouns typically describes the function of pronouns, which serve to avoid repetition and simplify sentences without providing descriptive detail. Thus, the choice identifying adjectives as descriptors of nouns encapsulates their fundamental role within a sentence structure.