Final answer:
The father's statement about an undescended testicle can reduce fertility demonstrates his understanding of the information presented.
Step-by-step explanation:
The statement by the child's father that would cause the nurse to determine he understands the information presented is a. An undescended testicle can reduce fertility.Undescended testicle, also known as cryptorchidism, is a condition where one or both testicles fail to move down into the scrotum. If left untreated, it can lead to reduced fertility in adulthood. Surgical correction, which involves moving the undescended testicle(s) into the scrotum, is the recommended treatment to minimize the risk of complications, including infertility and testicular tumors.