In an RLC Series Circuit, Which Is Connected to a Source

Multiple Choice

In an RLC series circuit, which is connected to a source of emf $\varepsilon$ _mcos( $\omega$ t) , the current lags the voltage by 45 $\degree$ if:

A) R = 1/ $\omega$ C - $\omega$ L
B) R = 1/ $\omega$ L - $\omega$ C
C) R = $\omega$ L - 1/ $\omega$ C
D) R = $\omega$ C - 1/ $\omega$ L
E) $\omega$ L = 1/ $\omega$ C