Which of the following frequency bands would most likely provide reliable communications between two stations that are 100 miles (160 km) apart?

Correct Answer: Option B — The Medium Frequency (MF) band.

Medium Frequency (MF) bands, specifically the 1605-4000 kHz range, are optimized for regional maritime communications. At 100 miles, MF signals utilize ground-wave propagation, which follows the Earth's curvature and remains stable during daylight hours, unlike HF, which relies on sky-wave reflection, or VHF, which is strictly limited by line-of-sight.