The correct answer is A: 50.0 MHz to 50.1 MHz and 144.0 MHz to 144.1 MHz. These segments are restricted to CW (Morse code) only operations according to FCC Part 97.305. These narrow segments at the bottom of their respective bands are reserved for CW to provide interference-free areas for this traditional mode. The 50.0-50.1 MHz segment is at the bottom of the 6-meter band, and 144.0-144.1 MHz is at the bottom of the 2-meter band. These segments are intentionally set aside for CW operations to ensure that CW operators have dedicated frequencies without interference from phone or digital modes. This reflects the historical importance of CW in amateur radio and provides a protected space for this efficient communication mode.