The correct answer is C. Running water habitat.
A lotic habitat is a type of aquatic habitat that is characterized by flowing water. This type of habitat can be found in rivers, streams, and creeks. Lotic habitats are important because they provide a home for a variety of aquatic organisms, including fish, invertebrates, and algae. They also play an important role in the water cycle by helping to filter and clean water.
Option A is incorrect because standing or still water habitats are known as lentic habitats. Lentic habitats are typically found in lakes, ponds, and wetlands.
Option B is incorrect because marine habitats are found in the ocean. Marine habitats are characterized by salt water and a variety of marine life, including fish, invertebrates, and algae.
Option D is incorrect because stagnant water is a type of lentic habitat. Stagnant water is characterized by still water and a lack of oxygen. This type of habitat is not suitable for most aquatic organisms.