The nurse assesses a young adult female who was brought to the emergency department (ED) by her boyfriend because she has not been feeling well all day and he believes she is getting worse. Which finding supports the nurse's suspicion that the client is experiencing appendicitis?

A. Sudden onset of severe anxiety, fear, and concern: These symptoms are not indicative of appendicitis. B. Periumbilical pain localizing to the right lower quadrant: This is a classic sign of appendicitis due to inflammation irritating surrounding tissues. C. Anorexia progressing to nausea, vomiting, and fever: While common in appendicitis, these findings are non-specific. D. Diffuse abdominal pain with elevated neutrophil count: Appendicitis pain typically localizes rather than remaining diffuse.