a b c d

d

$\text{Average Power consumed is }P_{av} =V_{rms}I_{rms}cos\phi $ $\Rightarrow P_{av} = \frac{100}{\sqrt 2} \frac{20}{\sqrt 2} \frac{1}{\sqrt 2} = \frac{1000}{\sqrt 2}$ $\text{Wattless Current } I = I_{rms} cos \phi = 10A$