Which of the following is correct for the electron affinity of halogens?

Which of the following has the least electron affinity in $kJ\,mol^{-1}$?

In which of the following pairs,electron gain enthalpies of constituent elements are nearly the same or identical?
$A$. $Rb$ and $Cs$
$B$. $Na$ and $K$
$C$. $Ar$ and $Kr$
$D$. $I$ and $At$
Choose the correct answer from the options given below.

In which of the following processes is the least energy required?

For the process
$A_{(g)} + e^- \to A^{-}_{(g)};$ $\Delta H = x$
and $A^{-}_{(g)} \to A_{(g)} + e^-;$ $\Delta H = y$
Select the correct statement:

Which of the following has the highest electron affinity $(EA)$?