13. Radio waves and gamma rays are both types of electromagnetic waves. Exposure to radio waves does not harm the human body, whereas exposure to gamma rays can be extremely dangerous. Why are gamma rays more dangerous? Gamma rays \( \qquad \)
A. are absorbed by the atmosphere, unlike radio waves.
B. travel faster than radio waves, making them more harmful.
C. carry more energy and can damage living tissues by ionizing atoms.
D. have longer wavelengths, which allows them to penetrate deeper into tissues.