Jane has a history of coronary artery disease (CAD) and is performing marching and lunges during an in-home visit. The patient suddenly reports chest pain, shortness of breath, and dizziness. The physical therapist's IMMEDIATE action should be:

A. Stop the exercise and have the patient sit down

B. Administer nitroglycerin and continue the exercise at a lower intensity

C. Call emergency medical services (EMS) immediately

D. Measure the patient's blood pressure and heart rate

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