A-25-year-old female presented to the emergency department because of moderate lower abdominal pain with a fever and chills. Two days ago, the patient had a therapeutic abortion at a local clinic. The patient reports minimal vaginal bleeding, Vital signs: T 100.8°F, RR 20, HR 92, BP 118/80, SpO₂ 99%. Pain 5/10.
What is the most likely diagnosis?

A. Endometritis
B. Urinary tract infection
C. Appendicitis
D. Pelvic abscess