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(C) The starting material is $1,2,3$-tris(hydroxymethyl)cyclopropane. Upon treatment with excess $H^+$ and heating,the primary alcohol groups are prot

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$1,3,5-$trimethylbenzene

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(C) The starting material is $1,2,3$-tris(hydroxymethyl)cyclopropane. Upon treatment with excess $H^+$ and heating,the primary alcohol groups are protonated to form $-OH_2^+$,which are good leaving groups. Loss of water molecules generates carbocations at the side chains. The cyclopropane ring undergoes ring expansion to relieve ring strain,eventually leading to the formation of a stable aromatic ring. The final product is $1,3,5$-trimethylbenzene (mesitylene).

The product $(A)$ is:

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