A client who has been experiencing infertility for the past 24 months received a new diagnosis of endometriosis. The client asks the nurse why this diagnosis has prevented them from becoming pregnant. Which of the following explanations is appropriate for the nurse to make?

Rationale: A. Insufficient FSH production relates to ovarian dysfunction, not directly to endometriosis. B. Endometriosis causes endometrial tissue to grow outside the uterus, which can cause scarring and block fallopian tubes, preventing fertilization. C. A benign tumor inside the uterus describes conditions like fibroids, not endometriosis. D. Chronic vaginal infections affect the vaginal environment but are unrelated to endometriosis and infertility caused by tubal blockage.