Which of the following frequencies is within the General class portion of the 15-meter band?

Explication

21300 kHz is 21.300 MHz, inside the General 15 meter segment of 21.275-21.450 MHz. 14250 kHz and 24900 kHz are also General frequencies but lie on 20 and 12 meters, and 18155 kHz is on 17 meters.