A Charged Capacitor Is Being Discharged Through a Resistor

Multiple Choice

A charged capacitor is being discharged through a resistor.At the end of one time constant the charge has been reduced by (1 - 1/e) = 63% of its initial value.At the end of two time constants the charge has been reduced by what percent of its initial value?

A) 82%
B) 86%
C) 100%
D) between 90% and 100%
E) need to know more data to answer the question