Which system is most likely to be affected by atmospheric disturbances?

Correct Answer: Option A — MF/HF radiotelephony

MF/HF radiotelephony is highly dependent on ionospheric conditions, making it vulnerable to atmospheric disturbances, solar flares, and seasonal variations. These factors cause signal fading and static, which can degrade voice quality and reliability compared to satellite-based systems or VHF, which are generally immune to these specific ionospheric propagation issues.