When a water body gets enriched with nutrients, the process is called as:

Correct option is B

Eutrophication is the process by which a body of water becomes overly enriched with nutrients, leading to excessive growth of organisms such as algae. This can result in oxygen depletion of the water body and harm aquatic life. The term is often used to describe the resultant algal blooms and the subsequent negative effects on water quality and aquatic ecosystems.