Correct Answer: 3, 1, 5, 2, 4

Solution : Given:
1. Accusable 2. Acerbity 3. Accursed 4. Acetify 5. Accuser

Step 1: Compare the first and second letters of each word. Since the first two letters of all the words are the same letter a and c. So, move on to the next letter.
Step 2: Compare the third letter of (Ac c usable, Ac c ursed, Ac c user, Ac e rbity, Ac e tify). The order is (Accusable, Accursed, Accuser) and (Acerbity, Acetify).
Step 3: Compare the fourth letter of (Acc u sable, Acc u rsed, Acc u ser), and (Ace r bity, Ace t ify). Since the fourth letter of the first three words is the same, Acerbity will come before Acetify as r comes before t according to the alphabetical system.
Step 4: Compare the fifth letter of (Accu s able, Accu r sed, Accu s er). The order is Accursed, (Accusable, Accuser) as r comes before s according to the alphabetical system.
Step 5: Compare the sixth letter of (Accus a ble, Accus e r). Accusable will come before Accuser as a comes before e according to the alphabetical system.

So, the sequence is Accursed, Accusable, Accuser, Acerbity, Acetify or 3, 1, 5, 2, 4. Hence, the third option is correct.