The Following Is NOT Correct Regarding Nitrogen Assimilation into Biomass $\equiv$

The following is NOT correct regarding nitrogen assimilation into biomass:

A) Different oxidation states of nitrogen require different amounts of reducing energy.
B) It is easy for living organisms to assimilate nitrogen due to its great stability (N $\equiv$ N) .
C) Nitrogen forms must be fully reduced to NH₃/ NH.
D) All of the above.
E) None of the above.