Final answer:
Medical assistants are most frequently responsible for filing insurance claims and handling insurers' payments in a medical practice.
Step-by-step explanation:
The correct answer is C) Medical Assistant. In a medical practice, medical assistants are responsible for most administrative tasks, including filing insurance claims and handling insurers' payments. They work closely with patients and interact with insurance companies to ensure that claims are processed accurately and that payments are received. Medical assistants are trained to understand insurance policies and navigate the complexities of medical billing.