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

Solution : Given:
1. Pristine   2. Precious   3. Pressure   4. Presume   5. Precaution

Step 1: The first and second letters of each word are the same, so move on to the next letter.
Step 2: The third letter of each word is either i or e . Based on the alphabetical order of these letters, we can arrange them: Pr e cious, Pr e ssure, Pr e sume, Pr e caution, Pr i stine.
Step 3: Compare the fourth letter of (Pre c ious, Pre s sure, Pre s ume, Pre c aution). (Precious, Precaution) will come before (Pressure, Presume) in the sequence as c comes before s in the alphabetical system.
Step 4: Compare the fifth letter of (Prec i ous, Prec a ution), and (Pres s ure, Pres u me). Precaution will come before Precious in the sequence as a comes before i in the alphabetical system. Similarly, Pressure will come before Presume in the sequence as s comes before u in the alphabetical system.

So, the sequence is Precaution, Precious, Pressure, Presume, Pristine, or 52341. Hence, the first option is correct.