Correct Answer: 2, 1, 3, 4

Solution : Given:
1. Instant 2. Inertia 3. Invincible 4. Invisible

Step 1: Compare the first and second letters of each word. Since all the words start with the same letter I and are followed by n , then move on to the next letter.
Step 2: The third letter of each word is e , s , or v . Based on the alphabetical order of these letters, we can arrange them – In e rtia, In s tant, In v incible, In v isible.
Step 3: Compare the fifth letter of (Invi n cible, Invi s ible). Invincible will come before Invisible in the sequence as n comes before s in the alphabetical system.

So, the sequence is – Inertia, Instant, Invincible, Invisible, or 2, 1, 3, 4. Hence, the second option is correct.