Answer:
C. Employment Agreements
Explanation:
Employment agreement is a formal agreement that specifies the conditions of the relationship between an employee and an employer indicating compensations and expectations that comes with the job description.
From the question, there are three (3) events. The first two which is the appointment and purchase involves immediate payment of cash for services rendered and goods bought respectively. While the third event needs an employment agreement because he only starts receiving his salary of $5000 monthly after working the first month.