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(C) The reaction proceeds in two steps: $1$. Friedel-Crafts acylation: The starting material is $1,2,4$-triethylbenzene. The acylation occurs at the p

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$1,2,4,5-$tetraethylbenzene

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(C) The reaction proceeds in two steps: $1$. Friedel-Crafts acylation: The starting material is $1,2,4$-triethylbenzene. The acylation occurs at the position that is least sterically hindered. The position between the two ethyl groups at $C-1$ and $C-2$ is highly hindered. Thus,the acetyl group enters at the position ortho to one ethyl group and meta to the other,resulting in the formation of $(A)$ (an acetylated triethylbenzene derivative). $2$. Wolff-Kishner reduction: The reagent $NH_2-NH_2, NaOH$ in triethylene glycol with heat is used for the Wolff-Kishner reduction,which converts the carbonyl group $(C=O)$ into a methylene group $(CH_2)$. This reduction of the acetyl group $(COCH_3)$ results in an ethyl group $(CH_2CH_3)$. Starting with $1,2,4$-triethylbenzene,the acylation followed by reduction adds another ethyl group to the ring. Based on the substitution pattern and steric hindrance,the final product $(B)$ is $1,2,4,5$-tetraethylbenzene.

Product $(B)$ is

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