Final answer:
The most accurate explanation for the administration of human chorionic gonadotropin to the 1-year-old is to help his undescended testes move into the scrotum, facilitating their proper development.
Step-by-step explanation:
The caregiver's question regarding their 1-year-old son being given human chorionic gonadotropin (hCG) can be clarified by explaining that the hormone is being administered because the child's testes have not descended into the scrotum, a condition known as cryptorchidism.
The most accurate statement is that the doctor is hoping that the hormone will cause your son's undropped testes to move into their proper place (option 3). This treatment is intended to stimulate the descent of the testes, which is essential for their normal functioning and development.