The correct order of electron affinity is

The correct option is B

N < Be < C < B

We know

EA $\alpha$

$\frac{1}{AtomicRadius}$

Here, Be > B > C > N [Atomic Radius]

Therefore it should be

N > C > B > Be

But N has half filled $p^{-}$ orbitals which make it very stable. So, N does not want to take an electron easily.

Therefore, its electron affinity becomes less than B and C.

So, the correct order will be

Be < N < B < C