Final answer:
Radio waves and microwaves are the electromagnetic waves commonly used in communication, due to their ability to transmit over long distances without much absorption by atmospheric or interstellar materials. Hence, option (c) is correct.
Step-by-step explanation:
The pair of electromagnetic waves commonly used for communication are radio waves and microwaves. These wavelengths are specifically chosen because they're less likely to be absorbed by interstellar gas and dust, and can penetrate Earth's atmosphere efficiently, making them more suitable for both terrestrial and satellite communications. For example, radio waves are extensively used for AM and FM radio, cellular telephones, and TV signals, while microwaves are used in satellite communications and also in microwave ovens.
Radio waves have a longer wavelength when compared to microwaves. The correct ordering from least to greatest wavelength generally would place radio at one end and gamma rays at the other, following this sequence: gamma ray, X-ray, ultraviolet, visible, infrared, microwave, and radio wave.