Which of the Following Experiments Helped to Determine the Charge

Multiple Choice

Which of the following experiments helped to determine the charge of an electron and (indirectly) its mass?

A) J.J. Thompson's cathode ray deflection experiments
B) R. Millikan's oil drop experiments
C) E. Rutherford's gold foil experiments
D) Avogadro's number experiments
E) Franklin's kite experiments