Final answer:
Human Chorionic Gonadotropin (hCG) prevents the deterioration of the corpus luteum during early pregnancy.
Step-by-step explanation:
The correct answer is C) Human Chorionic Gonadotropin (hCG).
The corpus luteum is responsible for producing estrogen and progesterone during early pregnancy. While estrogen and progesterone play important roles in maintaining the pregnancy, it is human chorionic gonadotropin (hCG) that specifically prevents the deterioration of the corpus luteum. hCG stimulates the corpus luteum to continue producing estrogen and progesterone, which are necessary for the development and maintenance of the pregnancy.