(B) Cathode rays were first observed and investigated by $William$ $Crookes$ in the late $19^{th}$ century. While $J.J.$ $Thomson$ is famous for disco

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(B) Cathode rays were first observed and investigated by $William$ $Crookes$ in the late $19^{th}$ century. While $J.J.$ $Thomson$ is famous for discovering the electron within these rays,the invention and initial study of the cathode ray tube and the rays themselves are attributed to $William$ $Crookes$.