Explanation:
In RNA (Ribonucleic acid), thymine is replaced by uracil.This ribonucleic acid acts as a template for the synthesis of proteins, where it transforms the genetic material from the genes to protein synthesis components, to form the amino acids.The nitrogenous bases are purines and pyrimidines. The purines are adenine and guanine. The pyrimidines are thymine and cytosine. In RNA, the thymine is replaced by uracil. Uridylic acid is formed by the combination of uracil as a nitrogenous base, ribose sugar, and triphosphate. It is mainly found in RNA. It is an ester of phosphoric acid with the nucleoside uridine.Hence, the correct option is (B).