Based on the information given, the most reasonable inference about some listeners based on their panicked reactions to the radio broadcast of The War of the Worlds is:
OC. They were ready to believe anything they heard on the radio.
The panicked reactions suggest that these listeners were highly susceptible to believing the information presented on the radio without questioning its validity. They may have had a tendency to take what they heard at face value, leading to their fearful response to the broadcast. This inference aligns with the historical context surrounding the panic caused by the realistic radio adaptation of The War of the Worlds in 1938