Correct Answer: 2, 5, 4, 3, 1

Solution : Given:
1. Resign 2. Repair 3. Residue 4. Research 5. Rescue

Step 1: Since all the words start with the same letter R , so move on to the next letter.
Step 2: The second letter of each word is the same, i.e. e . So, move on to the next letter.
Step 3: The third letter of each word is either p or s . The arrangement can be – Repair, (Resign, Residue, Research, Rescue).
Step 4: Compare the fourth letter of (Res i gn, Res i due, Res e arch, Res c ue). Rescue will come before Resign, Residue, and Research as c comes before i , and e according to the alphabetical system. Similarly, Research will come before Resign and Residue as e comes before i according to the alphabetical system.
Step 5: Compare the fifth letter of (Resi g n, Resi d ue). Residue will come before Resign as d comes before g according to the alphabetical system.

So, the sequence is Repair, Rescue, Research, Residue, Resign, or 2, 5, 4, 3, 1. Hence, the second option is correct.