The Figure Below Shows the Net Primary Productivity (NPP)in Marine

The figure below shows the net primary productivity (NPP) in marine biomes around the world with the darkest areas being the most productive.The pattern of NPP in marine ecosystems as shown suggests that

A) marine productivity is as sensitive to temperature as terrestrial productivity.
B) without shade from overhead vegetation, marine productivity typically exceeds that found in terrestrial ecosystems.
C) marine ecosystems are also limited by sunlight, with the highest productivity at the equator.
D) most marine productivity results from the input of terrestrially derived nutrients.