A 58-year-old woman presents with a breast mass. Which of the following responses by the clinician would be most appropriate?

a. “It is probably just a cyst, because that is the most common breast mass.”
b. “We will order a mammogram and ultrasound to help establish a diagnosis.”
c. “We will go ahead and schedule you for a biopsy because that is the only way to know for sure.”
d. “Because your lump is painful, it is most likely not cancer.”