6. A 12 k ohm resistor, a 15 k ohm resistor, and a 22 k ohm resistor are in series with two 10 k ohm resistors that are in parallel. The source voltage is 75 V. Current through the 15 k ohm resistor is approximately
A. 50 mA
B. 1.4 mA
C. 5 mA
D. 14 mA