Explanation: The localizer beam system, a crucial part of an Instrument Landing System (ILS), provides pilots with horizontal guidance to align with the runway centerline. This system operates in the Very High Frequency (VHF) band. The correct frequency range for ILS localizer transmissions is **108.10 MHz to 111.95 MHz**. This spectrum is specifically allocated for aviation navigation aids, distinct from general communication or other services. Options A and C are incorrect because they specify frequencies in kilohertz (kHz), which are far too low (LF/MF band) for this type of precision navigation system. Option B, 329.15 MHz to 335.00 MHz, represents the frequency range used for the *glideslope* component of the ILS, which provides vertical guidance, not the localizer's horizontal guidance.