A 23-year-old woman presents with a rubbery, freely movable 2-cm mass in the upper outer quadrant of the left breast. Which of the following histologic features is most likely to be seen when examining a biopsy specimen from this mass? 

a. Large numbers of neutrophils 

b. Large numbers of plasma cells 

c. Duct ectasia with inspissation of breast secretions 

d. Necrotic fat surrounded by lipid-laden macrophages 

e. A mixture of fibrous tissue and ducts