Which definition fits best for a pond?

The definition that fits best for a pond is the characterization of it as an artificially formed body of water smaller than a lake. Ponds are typically smaller than lakes and often created for specific purposes such as recreation, aesthetics, or supporting wildlife. While natural ponds exist, many are man-made to fulfill various needs, making this definition particularly comprehensive.

A pond's size differentiates it from a lake, which is generally larger and deeper. The distinction between ponds and lakes often lies in their ecological characteristics and depth, influencing the types of plants and animals that inhabit them. This definition encapsulates both the size aspect and the tendency for ponds to be artificial, making it the most precise option.