Which of the following represent the correct order of increasing first ionisation enthalpy for `Ca,Ba,S,Se` and `Ar`

Options

A. S lt Se lt Ca lt Ba lt Ar
B. Ba lt Ca lt Se lt S lt Ar
C. Ca lt Ba lt S lt Se lt Ar
D. Ca lt S lt Ba lt Se lt Ar

Answer

B

Explanation

The ionisation energy increases along a period from left to right and decreases along the group order is Ba < Ca < Se < S < Ar