Which of the following statements about radioactivity is true?
(i) Alpha particle is positively charged
(ii) Beta particle is negatively charged
(iii) Gamma ray is neutral
(iv) Beta particle has the same mass as helium atom
(v) Gamma ray is charged.

A. i, ii, iii, iv only
B. i, ii, iii only  
C. iv and v only
D. i, ii and v only

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Correct Answer: B