The correct answer is: B. Standing or still water habitat.
A lentic habitat is a standing or still water body, such as a pond, lake, or marsh. Lentic habitats are characterized by low water flow and a high degree of stratification, which means that the water is divided into layers with different temperatures and dissolved oxygen levels. This stratification can create different habitats for different organisms, and lentic habitats are home to a wide variety of plants and animals.
Option A, running water habitat, is incorrect because it describes a type of habitat with a high water flow. Option C, marine habitat, is incorrect because it describes a type of habitat that is found in the ocean. Option D, none, is incorrect because it is not a valid answer to the question.