How do rivers help in fisheries?

Correct answer: They provide water and habitat for fish

The direct answer is D: rivers provide water and habitat for fish. Fisheries depend on suitable water bodies where fish can live, feed, grow, reproduce, and move. Rivers provide flowing water, aquatic plants, smaller organisms as food, shelter in different river zones, and breeding spaces for many species. Therefore, rivers support both natural fisheries and human fishing activities. Option D is correct because it states the direct biological support that rivers give to fish. Option A is wrong because forming mountains is a geological process and is not how rivers help fisheries. Option B is wrong because rivers do not make air; air is not the required explanation for fish production. Option C is wrong because soil does not become gold, and this claim is impossible and irrelevant. Fish are a biological resource, so the correct link is river water and habitat. Pollution, overfishing, dams, and excessive water extraction can damage this support, so conservation is important. Memory cue: fisheries need fish, and fish need clean water plus habitat.