Benzene reacts with ethanoyl chloride and anhydrous $\mathrm{AlCl}{}_3$ to give X. X is warmed with $\mathrm{I}{}_2$ and excess aqueous $\mathrm{NaOH}$, and the aqueous layer is then acidified. The organic products formed in the two steps (the acid and the yellow solid) are

1. Aphenylacetic acid and triiodomethane ($\mathrm{CHI}{}_3$)
2. Bbenzoic acid and tetraiodomethane ($\mathrm{CI}{}_4$)
3. Cethanoic acid and iodobenzene
4. Dbenzoic acid and triiodomethane ($\mathrm{CHI}{}_3$)