Correct Answer: 3, 1, 2, 4

Solution : Given:
1. Defect 2. Defence 3. Deerstalker 4. Defensive

Step 1: Compare the first and second letters of each word. Since all the words have the same letters D and e , move on to the next letter.
Step 2: The third letter of each word is either e or f . Based on the alphabetical order of these letters, we can arrange them – De e rstalker, De f ect, De f ence, De f ensive.
Step 3: Compare the fifth letter of (Defe c t, Defe n ce, Defe n sive). Defect will come before Defence, and Defensive in the sequence as c comes before n in the alphabetical system.
Step 4: Compare the sixth letter of (Defen c e, Defen s ive). Defence will come before Defensive in the sequence as c comes before s in the alphabetical system.

So, the sequence is Deerstalker, Defect, Defence, Defensive, or 3, 1, 2, 4. Hence, the fourth option is correct.