Select the option that is related to the third term in

Solution

The logic followed here is as follows: Divide the word (from left end) into two groups of three letters each. In each group, the letters are arranged in alphabetical order. P         O         C         K         E         T C         O         P         E         K         T POCKET is written as COPEKT R         A         D         I           U         S A         D         R         I           S         U RADIUS is written as ADRISU