A 70-year-old female postmenopausal presents with vaginal bleeding. On physical exam, she has cervical stenosis. The next steps are to:
a. Perform an ultrasound and if normal an endometrial biopsy
b. Perform an ultrasound and if normal, observe
c. Perform an ultrasound and if normal do a D&C
d. Perform an ultrasound and if normal do a hysteroscopy