Pond is to lake as grove is to what?

The relationship between "pond" and "lake" is that both are bodies of water, with a pond being smaller in size than a lake. This establishes a comparison based on size within the same category of geographical features.

To apply this relationship to "grove," which refers to a small area of trees, we can look for a term that relates to "grove" in the same way that "lake" relates to "pond." Among the given choices, "forest" is the best fit since it denotes a larger area densely populated with trees, similar to how a lake is a larger body of water compared to a pond.

Thus, just as a pond is to a lake (both being aquatic environments with size differences), a grove is to a forest (both being tree-dominated landscapes with size differences).