Correct Answer: I W J I D W I J

Solution : Given:
C _ _ D _ C _ W _ J C I _ D J C _ W D _

To fill the series we have to divide the series – C _ _ D _ / C _ W _ J / C I _ D J / C _ W D _

Let's check each option –
First option: I W J I D W I J; C I W D J / C I W D J / C I W D J / C I W D J (CIWDJ has been repeated in the series.)
Second option: W I J D D J I W; C W I D J / C D W D J / C I J D J / C I W D W (No repeated pattern has been found)
Third option: D J I W J D I C; C D J D I / C W W J J / C I D D J / C I WD C (No repeated pattern has been found)
Fourth option: C D W J D I J W; C C D D W / C J W D J / C I I D J / C J WD W (No repeated pattern has been found)

So, the series becomes→CIWDJCIWDJCIWDJCIWDJ. Hence, the first option is correct.