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

Solution : Given:
1. Mouth 2. Mount 3. Moult 4. Mouse 5. Mound

Step 1: The first three letters of each word are the same M , o , and u , so move on to the next letter.
Step 2: The fourth letter of each word is t , n , l , s , n . Based on the alphabetical order of these letters, we can arrange them – Mou l t, Mou n t, Mou n d, Mou s e, Mou t h
Step 3: Compare the fifth letter of (Moun t , Moun d ). Mound will come before Mount in the sequence as d comes before t in the alphabetical system.

So, the sequence is Moult, Mound, Mount, Mouse, Mouth, or 3, 5, 2, 4, 1. Hence, the first option is correct.