Estimating Initial Current in an RC Circuit

A capacitor discharges through a resistor, transferring $3.6 \times 10^{-3}\ \mathrm{C}$ of charge in the first $0.12\ \mathrm{s}$. The current at time $t$ is given by $I(t) = I_0 e^{-t/RC}$, where the time constant $RC$ is unknown. Which of the following is the best estimate for the initial current, $I_0$?