Kelp forests are__________ ecosystems.

Correct option is C

The correct answer is: (c), marine
Kelp forests are marine ecosystems dominated by large brown algae called Kelp. Kelp are large brown algae that live in cool, relatively shallow waters close to the shore. They attach to the seafloor and eventually grow to the water’s surface and rely on sunlight to generate food and energy, kelp forests are always coastal and require shallow, relatively clear water.