SSC CGL 19 Oct 2014 Shift 2 Paper

If we combine the first and third letters and fourth and second letters in that order, theyform consecutive alphabets in English alphabetical series.
(A): $\mathit{A}\mathit{B},\mathit{Y}\mathit{Z}$
$\left(\mathit{B}\right):\mathit{C}\mathit{D},\mathit{W}\mathit{X}$
(C): EF,UV
(D):TS, HG (in reverse order)