Select the letter-Cluster that can replace the question mark (?) in the following series.ACD, EGH, IKL, ? QST

Select the letter-Cluster that can replace the question mark (?) in th

1.	Select the letter-Cluster that can replace the question mark (?) in the following series.ACD, EGH, IKL, ? QST
A.	MNO
B.	MOP
C.	NPQ
D.	NOP
Answer» C. NPQ