Which of the following terms best fits the meaning of being excessive or producing a lot?

The term that best fits the meaning of being excessive or producing a lot is "prolific." This word is often used to describe someone or something that produces a great quantity of works or outputs. For example, a prolific writer is one who produces numerous books, articles, or other written materials, indicating an abundance in creativity or productivity. It denotes not just the act of producing but doing so in significant amounts, which aligns perfectly with the idea of being excessive.

In contrast, propriety refers to conforming to accepted standards of behavior or morals, which is unrelated to the concept of quantity. Pundit describes an expert or critic, often in fields like politics or culture, without any implication of abundance or excess. Prose refers to written or spoken language in its ordinary form, lacking the rhythmic structure of poetry, which again does not convey the idea of producing a lot. Thus, "prolific" stands out as the term that accurately captures the essence of abundance or excessive production.