Which letter-cluster will replace the question mark (?) to complete the following series?PGD, SEE, VCF, ?, ?

Which letter-cluster will replace the question mark (?) to complete th

1.	Which letter-cluster will replace the question mark (?) to complete the following series?PGD, SEE, VCF, ?, ?
A.	YAH, BZH
B.	YAD, BYH
C.	ZBD, CYI
D.	YAG, BYH
Answer» E.