For Which One of the Following Circuit Arrangements Will the Power

Multiple Choice

For which one of the following circuit arrangements will the power factor be non-zero?

A) a capacitor in series with an ac generator
B) an inductor in series with an ac generator
C) two capacitors in series with an ac generator
D) a capacitor and resistor in series with an ac generator
E) a capacitor and inductor in series with an ac generator