The correct order of basic strength is:

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(C) $(i)$ $N$-methylaniline: The $+I$ effect of the methyl group increases basicity compared to aniline.$(ii)$ $p$-methoxyaniline: The $+M$ effect of

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$iii > ii > i > iv$

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(C) $(i)$ $N$-methylaniline: The $+I$ effect of the methyl group increases basicity compared to aniline.$(ii)$ $p$-methoxyaniline: The $+M$ effect of the $-OCH_3$ group significantly increases basicity,making it more basic than $N$-methylaniline.$(iii)$ Benzylamine: The $-NH_2$ group is not directly attached to the benzene ring,so the lone pair is not involved in resonance. It is the most basic.$(iv)$ Aniline: The lone pair on the $-NH_2$ group is involved in resonance with the benzene ring,making it the least basic.Comparing these,the order is: Benzylamine $(iii) > p$-methoxyaniline $(ii) > N$-methylaniline $(i) >$ Aniline $(iv)$.Therefore,the correct order is $iii > ii > i > iv$.

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