Select the correct option that will fill in the blank and complete the series. AB, BA, ABC, CBA, ABCD, _____.

Select the correct option that will fill in the blank and complete the

1.	Select the correct option that will fill in the blank and complete the series. AB, BA, ABC, CBA, ABCD, _____.
A.	DCBA
B.	CABD
C.	ACBD
D.	BACD
Answer» B. CABD