The correct answer is C) Ethics officer.
Derek oversees the investigation of wrongdoings in his organization and provides additional guidance and support to the employees. He also develops training programs for every department to maintain organizational conduct. The position that Derek most likely holds in his company is the Ethics officer.
Nowadays, corporations know that any wrongdoing can cost too much money and impacts the reputation of the company. That is why they have created an office or position that oversees the conduct of the employees and the activities of the organization. Everything that the company does has to be clear and transparent. That is the work of Derek as the Ethics officer, to make sure that the company acts in the right way.