A 17-year-old patient arrives at the emergency department reporting sudden severe pain in the right side of the lower abdomen. The patient's history indicates the patient is sexually active and has irregular menstrual cycles. Her last menstrual period was 9 weeks ago, and her vital signs are within high-normal limits. Which diagnosis would be probable for this patient?

a. Ruptured tubal pregnancy
b. Twisted right side ovary
c. Rupture of large ovarian cyst
d. Twisted right fallopian tube