Explanation: The international standard definition for the Medium Frequency (MF) band spans from 300 kilohertz (kHz) to 3,000 kHz, or 3 MHz. This range is commonly associated with AM broadcast radio, maritime communications, and some amateur radio bands like 160 meters. Let's look at the other options: * **A) 10-30 MHz** falls within the High Frequency (HF) band, which typically ranges from 3 MHz to 30 MHz. * **B) 1,000-10,000 kHz** (1-10 MHz) overlaps with the MF band (1-3 MHz) but extends significantly into the HF band (3-10 MHz), making it an incorrect and incomplete definition for MF. * **D) 30-300 kHz** defines the Low Frequency (LF) band, which is below MF.