Biology

The correct answer is: A.Pressure.

Here's why:

Abiotic factors are non-living components of an ecosystem that affect living organisms. In marine ecosystems, pressure is an abiotic factor because it is a physical condition of the environment that influences the organisms living there. The deeper you go in the ocean, the greater the pressure, and it affects the types of organisms that can survive in those depths.

Let’s break down the other options: