[单选题]
A 2.0-mF capacitor is cv67(x+d dj.w lcz6si fu8 s22dwh ky4qj2oec 5harged to 12 V and then discharged through a $4.0 \times 10^{6} \; \Omega$ resistor. How long will it take for the voltage across the capacitor to drop to 3.0 V?
A. $8.0 \; s$
B. $11 \; s$
C. $22 \; s$
D. $24 \; s$
