Answer:
Paired Comparison.
Step-by-step explanation:
A paired comparison is an efficient tool for comparing and evaluating employees and jobs with each of the employees and job. This tool of decision making was first developed by L. L. Thurstone. This tool helps to know which one is most preferable among all the entities.
In the given case, Raj can use the tool of Paired Comparison to know and evaluate each employee with each other. This tool will help him to know which one is better among four of his employees and who deserves how much of appraisal.
So, the correct answer is Paired Comparison.