What does a "plethora" of something indicate?

A "plethora" of something indicates an overabundance. The term is often used to signify that there is a very large quantity or an excessive amount of whatever is being referred to. In various contexts, it can imply not just having more than enough, but potentially too much of something, which could lead to issues or challenges. Therefore, when someone describes a "plethora," they are emphasizing the idea of quantity in a positive or negative light, but typically leaning more towards excess.

The other options describe quantities that are either balanced, deficient, or average, which do not align with the meaning of "plethora." Such distinctions are important for understanding the nuances of vocabulary and their implications in different contexts.