Select the combination of letters that when sequentially placed in the blanks will create a repetitive pattern.

j j _ _ k _ j _ _ k k k

Given: j j _ _ k _ j _ _ k k k

Now, we check each options.

Option (a): j k k j j

j j jk k k / j jj k k k

(Logical repeating pattern follows)

Option (b): j k j k k

j j jk k j j / kk k k k

Option (c): j j k k j

j j jj k k j /  kj k k k

Option (d): k j j j k

j j kj k j j / jk k k k

So, the logical pattern is follow: j j j k k k

Thus, correct option is (a).