Based on the frequency stated and emission mode, which of the following combinations is prohibited?

Fast-scan television (ATV) requires an extremely wide signal bandwidth, typically around 6 MHz. The entire 20-meter amateur band (14.000 to 14.350 MHz) is only 350 kHz wide, meaning an ATV signal would completely consume the band and still extend far outside of it, causing massive interference. In contrast, Slow-scan television (SSTV) uses a narrow bandwidth similar to a standard voice signal (around 3 kHz) and is legally permitted on 14.23 MHz. The other options listed, such as FM on 10 meters and SSB on 80 meters, are completely valid and normal operating modes for those frequencies.