(C) Nitrogen $(N)$ is a structural component of all $B$-complex vitamins.For example,Vitamin $B_1$ (thiamine) contains nitrogen in its pyrimidine and

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(C) Nitrogen $(N)$ is a structural component of all $B$-complex vitamins.For example,Vitamin $B_1$ (thiamine) contains nitrogen in its pyrimidine and thiazole rings.Vitamin $B_{12}$ (cyanocobalamin) contains a cobalt atom coordinated with nitrogen atoms in a corrin ring.Therefore,Vitamin $B$ is the correct answer.