The correct answer is: B. Both (A) and (R) are correct, but (R) is not the correct explanation of (A)

Assertion (A) is correct because staffing is the process of hiring and retaining employees who have the skills and abilities to perform the jobs that need to be done in an organization. When employees have the right skills and abilities, they are more likely to be productive and perform their jobs well. This can lead to higher performance for the organization as a whole.

Reason (R) is also correct because staffing enables the firm in obtaining suitable candidates for the institution. However, this is not the correct explanation of (A). Staffing does not necessarily lead to higher performance. There are other factors that can also affect performance, such as the quality of the organization's management, the level of employee motivation, and the availability of resources.

In conclusion, both (A) and (R) are correct, but (R) is not the correct explanation of (A).