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# Which of the following reaction is correctly formulated?

$\begin{array}{1 1} a \\ b \\ c\\ d \end{array}$

$MeC_6H_5$ is not active enough to couple with $PN_2^{\oplus}-C_6H_4-NMe_2$ and $PhN_2^{\oplus}$ couples only with the rings activated by strong activating groups only.
Hence (a) is the correct answer.