Step 1: Read the first transformation. Cis-2-butene is treated with hot acidic potassium permanganate, $\text{KMnO}_4/\text{H}^+$, which cleaves the double bond oxidatively. Step 2: Find the cleavage product. Each $=\text{CH}-\text{CH}_3$ end becomes a carboxyl group, so the alkene splits into two molecules of acetic acid, $\text{CH}_3\text{COOH}$. Step 3: Apply the dehydrating agent. Phosphorus pentoxide, $\text{P}_4\text{O}_{10}$, removes water and converts two acetic acid molecules into acetic anhydride, identifying intermediate A. Step 4: Read the second transformation. n-Heptane over a $\text{Cr}_2\text{O}_3/\text{Al}_2\text{O}_3$ catalyst undergoes aromatization (reforming) to give toluene. Step 5: Carry out Friedel-Crafts acylation. Toluene reacts with the acetylating species using $\text{AlCl}_3$, and the methyl group directs the incoming acetyl group mainly to the para position. Step 6: Name the final product and answer. The major product D is para-methylacetophenone (p-acetyltoluene), so the labelled structure matching A is figA, which is option 1. \[ \boxed{\text{figA}} \]
