How many ionisation energies can carbon have?

Which of the following electronic configurations represents the element with the lowest ionization energy?

Given below are two statements:
Statement $I$: The second ionization enthalpy of $B$,$Al$ and $Ga$ is in the order of $B > Al > Ga$.
Statement $II$: The correct order in terms of first ionization enthalpy is $Si < Ge < Pb < Sn$.

Given below are two statements:
Statement $I$: The decrease in first ionization enthalpy from $B$ to $Al$ is much larger than that from $Al$ to $Ga$.
Statement $II$: The $d$ orbitals in $Ga$ are completely filled.
In the light of the above statements,choose the most appropriate answer from the options given below:

Identify the element having lowest first ionization enthalpy.

What is the definition of ionization energy for an atom?