Which of the following letter groups is different?

C. X, Y, Z, A, B

Choose the group that does not belong:

D. B, C, D, E, F

Choose the odd letter group: AEF, BDF, CEG, DGH, EIJ

A. AEF

Choose the odd letter group: PQRS, TUVW, XYZA, BCDE, FGHI

C. XYZA

Identify the odd letter group from the following:

A. MNO