Final answer:
The correct action for a medical assistant making outgoing calls is confirming patient identity before sharing information, which ensures patient confidentiality and understanding.
Step-by-step explanation:
When communicating on the telephone with a patient, the action by a medical assistant that demonstrates the use of appropriate technique for outgoing calls is c) Confirming patient identity before sharing information. This step is crucial in protecting patient confidentiality and ensuring information security. Speaking loudly may not be necessary if one enunciates clearly, and using medical jargon could confuse the patient. Rushing through information typically leads to misunderstanding or missed details, which could compromise patient care. It is important to communicate effectively by using simple language, verifying the patient's identity, and ensuring that the patient understands the information being provided.