(B) . Urea is the diamide of carbonic acid. $\mathop {HO - \mathop {\mathop C\limits^{||} }\limits^O - OH}\limits_{\text{carbonic acid}} + 2NH_3$ $\xr

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It is a diamide of carbonic acid

(B) . Urea is the diamide of carbonic acid. $\mathop {HO - \mathop {\mathop C\limits^{||} }\limits^O - OH}\limits_{\text{carbonic acid}} + 2NH_3$ $\xrightarrow{- 2H_2O} \mathop {H_2N - \mathop {\mathop C\limits^{||} }\limits^O - NH_2}\limits_{\text{Urea}}$ Since two moles of $NH_3$ are required to replace both hydroxyl groups of carbonic acid,it is classified as the diamide of carbonic acid.