Given below are two statements :
Statement $I$ : When white light is passed through a prism,the red light bends less than yellow and violet light.
Statement $II$ : The refractive indices are different for different wavelengths in a dispersive medium.
In the light of the above statements,choose the correct answer from the options given below :

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