A 29-Year-Old Woman Is 28 Weeks Pregnant

A 29-year-old woman is 28 weeks pregnant. She complains of nausea, abdominal pain, and right shoulder pain. She states she vomited once, which caused temporary relief; however, the pain returned shortly afterward. She has no pertinent medical history or allergies, has stable vital signs, and states that she ate a cheeseburger about 20 minutes prior to the start of her pain. The most likely cause of this patient's presentation is:

A) food poisoning.
B) cholecystitis.
C) hyperemesis gravidarum.
D) appendicitis.