Correct Answer: Option A

Explanation

In 1910, Millikan successfully measured the charge of the electron to be 1.6 x 10\(^{-19}\)C.

Positive rays were discovered by Eugen Goldstein, in 1886.

J.J. Thomson discovered the charge-to-mass ratio of an electron in 1897: 

Cathode rays were discovered by. J. J. Thomson

There is an explanation video available below.

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