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.

Options

A. A and R both are correct statements but R is not correct explanantion for A
B. A is correct statement but R is wrong statement
C. A and R both are correct statements and R si correct explanation for A.
D. A and r both are wrong statements.