Ashley is preparing to perform a symptom-limited graded exercise test to determine functional exercise capacity and help develop an aerobic exercise prescription. Which of the following patients is the MOST appropriate candidate for this type of testing?

A) A patient with stable coronary artery disease who reports predictable substernal discomfort during prolonged uphill walking

B) A patient with acute pericarditis who reports chest discomfort at rest

C) A patient with suspected acute pulmonary embolism who developed sudden dyspnea earlier in the day

D) A patient with unstable angina who has experienced increasingly frequent chest pain during minimal activity

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