Direction: In each of the following letter series, some of the letters are missing, which are given in the same order as one of the alternatives below it. Chose the correct alternatives.
- 
					 _c_bd_cbcda_a_db_acb
- 
                        - bdbcba
- daabbc
- cdbbca
- adabcd
 
Correct Option: D
The sequence is made of abcd in random order.
The 3rd letter is replacing at first place and all other letter moving forward one step ahead except fourth letter.
acdb/dacb/cdab/acdb/da  ⇒  adabcd
 
	