The correct answer is C. deeper parts of the oceans.
Abyssal refers to the deepest parts of the ocean, which are below 2,000 meters (6,560 feet). The abyssal zone is characterized by its low temperatures, high pressure, and lack of light. It is home to a variety of organisms, including fish, invertebrates, and bacteria.
Option A is incorrect because the inner most part of the earth is called the core.
Option B is incorrect because organisms found in the shallow water zone of the seas are called neritic organisms.
Option D is incorrect because the term “abyssal” does refer to the deeper parts of the oceans.