Answer: B
ΔG∘=ΔH∘−TΔS∘. At 330 K: −161.0+0.396×330=−30.3 kJ (forward spontaneous). At 460 K: −161.0+0.396×460=+21.2 kJ (reverse spontaneous). The change of sign occurs at 407 K, consistent with forming the carbonyl at 330-350 K and decomposing it at 450-470 K.