A19-year-old woman with no prenatal care presents for evaluation of lower abdominal pain and fever. she estimates that she is approximately 6 months pregnant. on questioning, she acknowledges intermittent pain for two days and a gush of fluid shortly after the pain began. her temperature is 102.0°f. physical examination is notable for purulent material in the vaginal vault. which of the following is the most likely diagnosis? a) chorioamnionitis b) pelvic inflammatory disease c) endometritis d) urinary tract infection