This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Regarding paicle interaction true is 
Select and explain. 
A. Bragg peak observed with light mass electrons, B. Bremsstrahlung photons produced by a paicles, C. Electron scatter less than protons, D. Electrons stop sooner in low atomic number (than higher Z) materials
D: Electrons stop sooner in low atomic number (than higher Z) materials
Answer: D: Electrons stop sooner in low atomic number (than higher Z) materials 
Explanation: D i.e. Electrons stop sooner in low atomic number (than higher Z) materials