An RC Circuit Has a Time Constant of 2

Multiple Choice

An RC circuit has a time constant of 2.10 s.At t = 0,the capacitor is fully charged.At what time will the voltage across the capacitor be half of its initial value?

A) 0.728 s
B) 1.35 s
C) 1.46 s
D) 1.83 s
E) 2.58 s