In a series LCR circuit, resistance \[R=10\Omega \] and the impedance \[Z=20\Omega .\] The phase difference between the current and the voltage is [KCET (Engg./Med.) 1999]

• A.   \[{{30}^{o}}\]     
• B.   \[{{45}^{o}}\]
• C.   \[{{60}^{o}}\]     
• D.   \[{{90}^{o}}\]