You Are Resigning from Your Work as a Nursing Assistant

You are resigning from your work as a nursing assistant. What is the most appropriate action for you to take?

A) Call the agency and inform the employer that you will not be reporting for work the next day.
B) Call the agency and submit a resignation letter afterwards.
C) Find somebody to replace you and recommend him/her to the Human Resource Department.
D) Write a resignation letter indicating your reason for leaving, last date you will work, and gratitude to the employer for the opportunity to work in the agency.