A physical therapist is reading a stress test report. A 55-year-old male patient achieved stage III of the Bruce protocol. ECG showed one box of S-T depression at peak exercise, occasional isolated premature ventricular contractions (PVCs,) and a max HR of 140. Which of the following is the MOST accurate interpretation of the test results?

a) the patient became tachycardic during the test
b) the patient was on the treadmill for 9 minutes
c) the patient achieved a MET level of three
d) the patient requires emergent catheterization