Given below are two statements:
Statement-$I$: The figure shows the variation of stopping potential $(V_0)$ with frequency $(v)$ for two photosensitive materials $M_1$ and $M_2$. The slope gives the value of $\frac{h}{e}$,where $h$ is Planck's constant and $e$ is the charge of an electron.
Statement-$II$: $M_2$ will emit photoelectrons of greater kinetic energy for incident radiation having the same frequency.
In the light of the above statements,choose the most appropriate answer from the options given below.

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