Correct Answer: 2, 3, 1, 4

Solution : Given:
1. Centre 2. Center 3. Central 4. Centrum

Step 1: Compare the first letter of each word. Since all the words start with the same letter C , then move on to the next letter.
Step 2: The second, third, and fourth letters of each word are the same, i.e., e , n , and t . So, move on to the next letter.
Step 3: The fifth letter of each word is either r or e . Based on the alphabetical order of these letters, we can arrange them – Cent e r, Cent r e, Cent r al, Cent r um
Step 4: Compare the sixth letter of (Centr e , Centr a l, Centr u m). Central will come before Centre and Centrum in the sequence as a comes before e , and u in the alphabetical system. Similarly, Centre will come before Centrum as e comes before u .

So, the sequence is Center, Central, Centre, Centrum, or 2, 3, 1, 4. Hence, the fourth option is correct.