Which statement describes the availability of carbon in the ocean and its use by marine processes?
A. The ocean is a carbon sink, with carbon being utilized by photosynthesis of phytoplankton.
B. The ocean is a carbon sink, with carbon lost due to the transpiration of marine algae.
C. he ocean is a carbon source, with carbon being utilized during thermocline formation.
D. The ocean is a carbon source, with carbon lost due to the respiration of marine mammals.