Which of the following is correct statement ?

Options

A. The ratio of e/m value for `H^+ & He^+` is 1:2
B. The ratio of e/m value for `He^+ & Li^(2+)` is 7:8
C. The ratio of elm value for `Li^(2+)` & `Be^(3+)` is 9:8
D. The ratio of e/m value for `._1^1H^+` & `._1^2H^+` is 1:2