(D) The correct answer is $D$. Plants primarily absorb nitrogen from the soil in the form of nitrate $(NO_3^-)$,which is an oxidised form of nitrogen.

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(D) The correct answer is $D$. Plants primarily absorb nitrogen from the soil in the form of nitrate $(NO_3^-)$,which is an oxidised form of nitrogen. Although some plants can also absorb ammonium $(NH_4^+)$,nitrate is the most common and preferred source for most terrestrial plants.