Amineral a. has a chemical formula. c. has a characteristic internal structure.

I know the answer with is radio waves, but I'm not sure what out of your selection it could be ill add some things I know from my class in the explanation that hopefully help you or another wiss!

Explanation:

Are radio waves completely different physical objects than gamma-rays? They are produced in different processes and are detected in different ways, but they are not fundamentally different. Radio waves, gamma-rays, visible light, and all the other parts of the electromagnetic spectrum are electromagnetic radiation. Electromagnetic radiation can be described in terms of a stream of mass-less particles, called photons, each traveling at light speed.