One electron has a mass of

A. 1 amu

B. 2 amu

C. 0 amu

D. 3 amu

Expressed in terms of "Atomic Mass Units, the electron's mass is

about 0.00054. That is, it takes about 1,840 electrons to add up to

1 AMU of mass.

Choice-C on the list is not exactly true, but it's a lot closer than any

of the others.