Given below are two statements:
Statement $I$: The first ionization energy of $Pb$ is greater than that of $Sn$.
Statement $II$: The first ionization energy of $Ge$ is greater than that of $Si$.
In the light of the above statements,choose the correct answer from the options given below:

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