Assertion: Boron has a smaller first ionisation enthalpy than beryllium.
Reason: The penetration of a `2s` electron to the nucleus is more than the `2p` electron, hence `2p` electorn is more shielded by the inner core of electrons than the 2s electrons.
A. (II), (III), and (IV)
B. (I), (II), and (IV)
C. (I), (II), and (III)
D. (I), (III)j, and (IV)
