Select the letter-cluster that can replace the question mark (?) in the following series.DXTU, HXXU, LXBU, ?

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.DXTU, HXXU, LXBU, ?
A.	OXFU
B.	PYFU
C.	PXFU
D.	PBFY
Answer» D. PBFY