Final answer:
The international distress frequency in the MF band is 2182 kHz, which is different from the provided options. The options listed are VHF frequencies, with a. 121.5 MHz being the international air distress frequency.
Step-by-step explanation:
The international distress frequency in the MF band is not provided among the options A through D, as they are in the VHF range. Typically, the international distress frequency in the MF band is 2182 kHz, which is not represented in the question's choices.
All the given options, 121.5 MHz, 121.9 MHz, 122.2 MHz, and 126.7 MHz are frequencies in the aviation VHF band, with a. 121.5 MHz being the correct international air distress frequency (VHF).