What kind of waves are typically used in radio communication?

The correct choice identifies the range of frequency bands commonly utilized in radio communication, which is from 3 kHz to 300 GHz. This range encompasses various subbands, including very low frequencies (VLF), low frequencies (LF), medium frequencies (MF), high frequencies (HF), very high frequencies (VHF), ultra-high frequencies (UHF), and super high frequencies (SHF). Each of these frequency bands has specific applications in radio communication, such as AM and FM radio broadcasting, television, satellite communication, and mobile communications.

The other options, while they refer to types of waves used in different contexts, do not accurately define the expansive range utilized specifically for radio communication. Infrared waves are primarily associated with thermal imaging and remote controls, microwaves are a subset within the radio spectrum generally used for certain communications and cooking, and X-rays play a crucial role in medical imaging but are not used for radio communication. Hence, the range of frequencies between 3 kHz and 300 GHz represents the full bandwidth for effective radio communication across various services and technologies.