A physical therapist is working with a patient who experienced an acute myocardial infarction 5 days ago. The patient has been hospitalized since the event and working with physical therapy daily. The patient currently requires moderate assistance from the therapist to sit at the edge of bed and can tolerate unsupported sitting for only 1 minute before needing to lie down, although vital sign response is within normal limits. Which of the following treatments should the therapist provide AT THIS TIME?

a) continue with edge of bed sitting until patient can tolerate 3-5 minutes unsupported
b) progress to sit-to-stand since it is 5 days post event
c) initiate ambulation with a front-wheeled walker to improve cardiac status
d) discontinue physical therapy until patient is more medially stable