A DSC distress alert transmitted on VHF Channel 70 is a recognized distress signal under 33 CFR §87.01. On which MF frequency is a DSC distress alert also authorized under that same section?

Why B is correct

33 CFR §87.01(l)(ii) lists 2187.5 kHz as one of the authorized MF/HF frequencies for a DSC distress alert. 2182.0 kHz is the international radiotelephone distress frequency but is not listed in §87.01(l)(ii); 4125.0 kHz and 8291.0 kHz are voice working frequencies, not DSC distress frequencies listed in this section.