A new mother calls the clinic to report that part of her left breast is red,swollen,tender,very hot,and hard.She has a fever of 101° F.She has also had symptoms of the flu,such as chills,sweating,and feeling tired.The nurse notices that she has been breastfeeding for 1 month.From her description,what condition does the nurse suspect?
A) Mastitis
B) Paget's disease
C) Plugged milk duct
D) Mammary duct ectasia