Final answer:
The correct answer to the question 'The _____ is part of the open ocean with enough light to support algae.' is the neritic zone, which is the part of the ocean that receives enough sunlight to support photosynthesis and hence algae.
Step-by-step explanation:
The area of the open ocean that supports algae due to sufficient light is known as the neritic zone. The neritic zone extends from the intertidal zone to depths of about 200 meters at the edge of the continental shelf, making it able to receive enough sunlight for photosynthesis to occur. This zone is home to phytoplankton, Sargassum, zooplankton, protists, small fishes, and shrimp, which form the basis of the food chain for many of the world's fisheries.
Photosynthetic organisms thrive in the photic zone, which includes the neritic zone and parts of the oceanic zone, but not in areas where light does not penetrate sufficiently such as the aphotic or abyssal zones. These zones, due to the lack of light, do not support photosynthesis, which requires sunlight for the production of energy in plants and algae.
Thus, the correct answer to the question 'The _____ is part of the open ocean with enough light to support algae.' is B) Neritic zone.