Given below are two statements:
Statement $I$: When the frequency of an $a.c.$ source in a series $LCR$ circuit increases,the current in the circuit first increases,attains a maximum value,and then decreases.
Statement $II$: In a series $LCR$ circuit,the value of the power factor at resonance is one.
In the light of the given statements,choose the most appropriate answer from the options given below:

• A
  Statement $I$ is incorrect but Statement $II$ is true.
• B
  Both Statement $I$ and Statement $II$ are false.
• C
  Statement $I$ is correct but Statement $II$ is false.
• D
  Both Statement $I$ and Statement $II$ are true.