A Patient Presents with Left Lower Quadrant Abdominal Pain That

A patient presents with left lower quadrant abdominal pain that increases with coughing and straining, fever, flatulence, and abdominal distention. Altered bowel habits are also reported. Physical examination reveals a palpable tender rectal mass. CT scan reveals inflammation of outpouchings of the sigmoid colon's intestinal mucosa. The patient is most likely diagnosed with:

A) Crohn's disease
B) Diverticulitis
C) Ulcerative colitis
D) Appendicitis