Which xylene is most easily sulphonated?

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(C) $m-xylene$ is most easily sulphonated because it has the most reactive positions available for electrophilic substitution.In $m-xylene$,the two me

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$Meta-xylene$

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(C) $m-xylene$ is most easily sulphonated because it has the most reactive positions available for electrophilic substitution.In $m-xylene$,the two methyl groups are at $1,3-$ positions,which activates the $2, 4,$ and $6$ positions towards electrophilic attack.Specifically,the $4$ position is highly activated and less sterically hindered compared to the positions in $o-xylene$ and $p-xylene$.

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