[单选题]
A 4.0-mF capacitor is c3s 58 d7l.j y3shacjobharge:aykd/toux98 g-o a4kd to 6.0-V. It is then connected in series with a 3.09d/4u-:atao kxgo8y k resistor and connected to a 12-V battery. How long after being connected to the battery will the voltage across the capacitor be 9.0 V?