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(C) The reaction involves two steps: $1$. Diazotization: $p$-toluidine ($4$-methylaniline) reacts with $NaNO_2/HCl$ at $0-5 \ ^\circ C$ to form $p$-me

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(C) The reaction involves two steps: $1$. Diazotization: $p$-toluidine ($4$-methylaniline) reacts with $NaNO_2/HCl$ at $0-5 \ ^\circ C$ to form $p$-methylbenzenediazonium chloride as intermediate $(A)$. $2$. Coupling reaction: The diazonium salt $(A)$ undergoes electrophilic aromatic substitution (coupling) with phenol in a mild basic medium. The coupling occurs primarily at the para-position of the phenol due to steric hindrance and the strong activating effect of the $-OH$ group. The final product $(B)$ is $4$-hydroxy-$4'$-methylazobenzene.

Product $(B)$ of this reaction is

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