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(C) The reaction involves the protonation of the carbonyl oxygen of the $2$-methylcycloprop-$2$-en-$1$-one molecule by $H_3O^+$.Upon protonation,the o

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(C) The reaction involves the protonation of the carbonyl oxygen of the $2$-methylcycloprop-$2$-en-$1$-one molecule by $H_3O^+$.Upon protonation,the oxygen atom gains a positive charge,which facilitates the delocalization of the pi-electrons from the double bond into the ring.This process generates a cyclopropenyl cation intermediate,which is aromatic due to the presence of $2 \pi$-electrons ($H$ückel's rule,$4n+2$ where $n=0$).Therefore,the protonated form is the major stable product because it achieves aromaticity.

The major product in the following reaction is

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