The ¹H NMR spectrum of an unknown compound shows absorptions at (no multiplicities given) δ = 7.3 (5H), 2.3 (1 H), and 0.9 (6 H) ppm. One of the following five structures satisfies these data. Which one? (The ¹H NMR signal for ethane is at δ = 0.9 ppm, that for benzene at δ = 7.3 ppm.)