The correct option is C Anti-HCG antibodies
hCG (human Chorionic Gonadotrophin) is a hormone that is produced by placental cells that nourish the fertilized egg after it is attached to the uterine wall. A pregnancy kit helps to determine whether a woman is pregnant. The urine of a pregnant woman will have hCG present in it and the pregnancy kit will have antibodies specific to hCG. A colored reaction helps in detecting the presence of hCG confirming a positive pregnancy.