Answer:
Option D.
This is probably a person-job fit issue, and Joshua's job should be re-designed.
Step-by-step explanation:
Personality-job fit theory also known as person-job fit revolves around the idea that every organization and individual has specific personality trait. The closer the traits between the person and the company match, the higher the chance of workplace productivity and satisfaction.
It is also referred to as person-environment fit (P-O fit), a common measure of the P-O fit is the workplace efficacy; the rate at which workers are able to complete tasks.
Since Joshua has proven himself to be a valuable employee but lacking in adminstrative abilities. The problem is a P-O fit issue, therefore, his job should be re-designed so as to fit his personality (adminstrative abilities).