A coil of inductive reactance 31 ohm has a resistance of 8 ohm. It is placed in series with a condenser of capacitive reactance 25 ohm. The combination is connected to an ac source of 110V. The power factor of the circuit is
| A. |
0.33 |
| B. |
0.56 |
| C. |
0.64 |
| D. |
0.80 |
 |