At t = 0, the switch s is closed with the capacitor uncharged. If C = 50 μF, ε = 20 V, and R = 4.0 kΩ, what is the charge on the capacitor when i = 2.0 mA?

a) 0.4 mC
b) 0.8 mC
c) 1.0 mC
d) 1.2 mC