Correct option is B) A lentic ecosystem is an ecosystem of a still water like pond, lakes. A lotic ecosystem is an ecosystem of a freely flowing water like stream, ocean. Benthic ecosystem includes the bottom of the water bodies that is sea floor or bottom of lake. Xeric ecosystem is an ecosystem of desert area containing very little water.

Lentic Ecosystem or Lotic Ecosystems Examples include: creeks, streams, runs, rivers, springs, brooks and channels. Some examples of lotic ecosystems are any ecosystem that presents moving water, such as rivers, streams, springs, streams, and canals.

Lotic ecosystems can be contrasted with lentic ecosystems, which involve relatively still terrestrial waters such as lakes, ponds, and wetlands. Together, these two ecosystems form the more general study area of freshwater or aquatic ecology .