The diagram shows a tropical ocean food chain with 10 % efficiency of energy transfer between trophic levels.
phytoplankton $ \to $ herbivorous zooplankton $ \to $ carnivorous zooplankton $ \to $ small fish $ \to $ tuna Net primary production of phytoplankton is $1300g\,{m^{ - 3}}\,y{r^{ - 1}}$.
What is the net primary production per year for the carnivorous zooplankton and the tuna?

A
2 )
B
3 )
C
4 )
D
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