E1B02:Which of the following is an acceptable bandwidth for digital voice or slow-scan TV transmissions made on the HF amateur bands?
Direct answer summary (2024-2028 NCVEC pool)
The official correct answer for E1B02 is 3 kHz.
The key fact is 3 kHz. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.