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

Solution : Given:
1. Ratio   2. Raise   3. Rapid   4. Robin   5. Royal

Step 1: Compare the first letter of each word. Since all the words start with the same letter R , move on to the next letter.
Step 2: The second letter of each word is either a or o . Based on the alphabetical order of these letters, we can arrange them – R a tio, R a ise, R a pid, R o bin, R o yal
Step 3: Compare the third letter of (Ra t io, Ra i se, Ra p id) and (Ro b in, Ro y al). Raise will come before Ratio, and Rapid in the sequence as i comes before t , and p in the alphabetical system. Also, Rapid will come before Ration in the sequence as p comes before t in the alphabetical system. Similarly, Robin will come before Royal as b comes before y .

The sequence is Raise, Rapid, Ratio, Robin, Royal, or 2, 3, 1, 4, 5. Hence, the first option is correct.