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# The percentage of sulphur used for vulcanisation of natural rubber for making tyres and battery case are respectively.

$\begin{array}{1 1}(a)\;30\%,5\%\\(b)\; 5\%,35\%\\(c)\;6\%,30\%\\(d)\;5\%,30\%\end{array}$

The extent of stiffners of valcanised rubber depends on the amount of sulphur added.About 5% sulphur is used for making tyre rubber while 30% of sulphur is used for making battery case rubber.
Hence (d) is the correct answer.