Correct Answer: 52143

Solution : Given:
1. Nested 2. Nation 3. Nippon 4. Niger 5. Nappy

Step 1: Compare the first letter of each word. Since all the words start with the same letter N , then move to the next letter.
Step 2: The second letter of each word is – e, a, i, i, a. Based on the alphabetical order of these letters, we can arrange them – N a tion, N a ppy, N e sted, N i ppon, N i ger.
Step 3: Compare the third letter of (Na t ion, Na p py) and (Ni p pon, Ni g er). Nappy will come before Nation in the sequence as p comes before t in the alphabetical system. Similarly, Ni g er will come before Ni p pon in the sequence as g comes before p in the alphabetical system.

The sequence will be Nappy, Nation, Nested, Niger, Nippon, or 52143. Hence, the first option is correct.