Which of the following statements is NOT true of $\gamma$-rays?

A. $\gamma$-rays belong to the electromagnetic spectrum
B. $\gamma$-rays do not carry an electron charge
C. $\gamma$-rays obey the inverse cube law in air  
D. the thickness of aluminium which stops b-particule has a negligible effect on $\gamma$-radiation
E. the difference between $\gamma$-rays and X-rays is that $\gamma$-rays originate from energy charges in the nuclei of atoms, while X-rays comes from energy charges associated with the electron structure of atoms

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Correct Answer: C