Which choice best describes why 90% of all marine organisms thrive/live in the photic zone?

it's where the sun still reaches and the pressure is not overwhelming

The choice that describes the presence of most of the organisms in the photic zone is because there is presence of sunlight in this region of the ocean

Explanation:

The ocean has many light zones namely the photic zone that has penetration of sunlight, the twilight zone that has very little sunlight penetration and the midnight zone which does not have any penetration of sunlight, since the organisms require sunlight for survival so the marine organisms prefer photic zone of the ocean.