Correct option is A
Given:
ABC_C_CC_DCBG_CA
From the given options –
(a) DCEE
ABC DC CCC EDCBG ECA (Followed the pattern.)

(b) DCED
ABC DC CCC EDCBG DCA
(c) EDCE
ABC EC DCC CCCBG ECA
(d) ECDC
ABC EC CCC DDCBG CCA