The correct order of electron affinity of $B, C, N, O$ is

The second electron affinity of an element is ...

Electron affinity is the

The electron affinity values are negative for:
$A$. $Be \rightarrow Be^{-}$
$B$. $N \rightarrow N^{-}$
$C$. $O^{-} \rightarrow O^{2-}$
$D$. $Na \rightarrow Na^{-}$
$E$. $Al \rightarrow Al^{-}$
Choose the most appropriate answer from the options given below:

The set containing the elements with positive electron gain enthalpies is

The correct order of electron gain enthalpy of $N$,$O$,$Cl$,$Al$ is