A 35 year old woman presents to the physician's office after she palpated a lump in her right breast. She has no other complaints. She has not seen a doctor for 10 years. She regularly performs breast self-exams after menses. Breast examination shows a 1 * 1 cm rubbery, firm, freely mobile round mass in the upper, outer quadrant of the right breast, no axillary lymph nodes are palpable.
Which of the following is the most appropriate next step in management?
a) Observation.
b) Ultrasonography.
c) Excisional biopsy.
d) Mammography.
e) Fin needle aspiration.
