Answer: Joy, who likes to work hard until a task is completely finished.
Explanation:
From the question, we are informed that Arney has been retained by Fluffy Soft Programmers to hire a new worker because he is an expert at personality types and their effect on job performance.
Out of the options that are given in the question, Arney should hire Joy, who likes to work hard until a task is completely finished. Other options are not good options in this case and wouldn't bring positivity to the organization.