Net primary production is: the net energy received by plants after subtracting what is turned into plant material. only the energy received by plants that is converted into protein. the amount of material a plant accumulates as a result of photosynthesis. the total energy received by plants from sunlight. the total energy received by plants from sunlight in usable wavelengths.

The correct answer is the net energy received by plants after subtracting what is turned into plant material. 

Plants convert the energy they receive from the sun into chemical energy the plants and other organisms can use. We must not forget that plants are living organisms and they use a part of the energy they convert for their metabolic processes. The amount of energy that is left after the plants use some for their cell processes is the net primary production. 

idk but if i had to take an educated guess i’d say a c d