5. A certain series circuit consists of a 1/8 W resistor, a 1/4 W resistor, and a 1/2 W resistor. The total resistance is 1200 ohm. If each resistor is operating in the circuit at its maximum power dissipation, total current flow is
A. 190 mA
B. 27 mA
C. 2.7 mA
D. 19 mA