The first to fifth ionization energies (IE) of two p-block elements $\mathbf{X}$ and $\mathbf{Y}$ are given below.
$\begin{array}{|c|c|c|c|c|c|}<br/>\hline & \mathrm{IE}_1(\mathrm{eV}) & \mathrm{IE}_2(\mathrm{eV}) & \mathrm{IE}_3(\mathrm{eV}) & \mathrm{IE}_4(\mathrm{eV}) & \mathrm{IE}_5(\mathrm{eV}) \\<br/>\hline \mathbf{X} & 6.0 & 18.8 & 28.4 & 120.0 & 153.7 \\<br/>\hline \mathbf{Y} & 8.2 & 16.3 & 33.5 & 45.1 & 166.7 \\<br/>\hline<br/>\end{array}$
The number of valence electrons in $\mathbf{X}$ and $\mathbf{Y}$ respectively are

• Correct answer
  A

  3,4
• B

  1,4
• C

  4,5
• D

  3,5

Hence, the correct answer is option: 'A'.