[单选题]
A 2.0-mF capacitor is charged to 12 V andqi9s /c:4.ep* rdlvpj then orl2c4 (q5ou8-rl/1enowotk 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. $24 \; s$
