No net primary production occurs below the ocean depth where light is 1% of surface light below the compensation depth where respiration equals or exceeds production all of the above are correct. none of the above is correct.

No net primary production occurs BELOW THE OCEAN DEPTH WHERE LIGHT IS 1% OF SURFACE LIGHT.

Net primary production = gross photosynthetic carbon fixation - the carbon respired to support maintenance requirements of the whole plant.

In short, net primary production is the "available" carbon left for to aid in plant growth and consumption of other heterotrophic organisms.