An organic compound '$\mathrm{A}$' $\left({\mathrm{C}}_9{\mathrm{H}}_{10}\mathrm{O}\right)$ when treated with conc. $\mathrm{HI}$ undergoes cleavage to yield compound '$\mathrm{B}$' and '$\mathrm{C}$'. '$\mathrm{B}$' gives yellow precipitate with ${\text{AgNO}}_3$ where as '$\mathrm{C}$' tautomerizes to '$\mathrm{D}$'. '$\mathrm{D}$' gives positive iodoform test. '$\mathrm{A}$' could be:

Two compounds $\mathrm{A}$ and $\mathrm{B}$ with same molecular formula $\left({\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}\right)$ undergo Grignard reaction with methylmagnesium bromide to give products $\mathrm{C}$ and $\mathrm{D}$. Products $\mathrm{C}$ and $\mathrm{D}$ show following chemical tests.

$\mathrm{C}$ and $\mathrm{D}$ respectively are

The major aromatic product $\mathrm{C}$ in the following reaction sequence will be :

The major product of the following reaction is:

The major product of the following reaction is: