6. For the types of radiation given, which of the following is the correct order of increasing ability to penetrate the skin?

6. For the types of radiation given, which of the following is the correct order of increasing ability to penetrate the skin?

A. Alpha particles < gamma rays < beta particles

B. Alpha particles < beta particles < gamma rays

C. Beta particles < alpha particles < gamma rays

D. Beta particles < gamma rays < alpha particles 

E. Gamma rays < alpha particles < beta particles