Correct Answer: OLOXELY

Solution : Given:
CL_VEC_ _WECLO_ _C_O_E

To complete the series, divide the series into equal parts as shown below –
CL_VE/C_ _WE/CLO_ _/C_O_E
Let's check each option —
First option: OLPXELY; CL O VE / C LP WE / CLO XE / C L O Y E (No repeated pattern has been found.)
Second option: OLOYELZ; CL O VE / C LO WE / CLO YE / C L O Z E (No repeated pattern has been found.)
Third option: OLOXFMY, CL O VE / C LO WE / CLO XF / C M O Y E (No repeated pattern has been found.)
Fourth option: OLOXELY; CL O VE / C LO WE / CLO XE / C L O Y E (Here, CLO_ E is repeated and the fourth letter is increased by one.)

So, the series becomes – CLOVECLOWECLOXECLOYE. Hence, the fourth option is correct.