Work Step by Step
Option A is incorrect. The benthic zone is at the bottom of oceans, lakes, and streams, so there is little light for photosynthesis to occur. Option B is incorrect. In aphotic zones, there is no light for photosynthesis, so these algae cannot survive at these depths. Option D is incorrect. The ocean trenches lie at the bottom of oceans where light does not penetrate. Option C is correct. The photic zone is the top layer of oceans that light can penetrate. Where light can reach is where we will find photosynthetic organisms such as algae.