The correct option is (a) 6.25*10^21
The best explanation: Electron has the charge of 1.602*10^-19 Coulomb. So, the number of electrons in 1 Coulomb of charge is \(\frac{1}{1.602*10^{-19}}\) = 6.25*10^21. This huge number of electrons can be accumulated to form 1C of charge. Thus, we can conclude that we need Avogadro’s number of electrons (approximately) to get 100C charges.