Explanation:

Sol. Ans.(c). Observing the sequence and by putting various options you can find that the correct sequence is ababa bcbcb cdcdc deded. You have to find a repeated pattern. Only (c) gives that pattern.

By putting (a), we would get – ababa bbbcb cdcdc deddd – there is no pattern in it

By putting (b), we would get – ababa bbbcb ddcdc deded – there is no pattern in it

By putting (d), we would get – ababb bcbcb ddcdc deded – there is no pattern in it