Choose the correct order of the given alternative : _ bcdbc _ dcabd _ bcdbc _ dc _ bd
A). aaaaa
B). ccccc
C). bbbbb
D). ddddd
aaaaa
The series is abcd/bcad/cabd/abcd/bcad/cabd. Clearly, each group consists of letters of the previous group in the order - second, third, first and fourth.