The correct option is A Bile salts
Hexacanth is the larval stage of pork tapeworm. Pork tapeworm is an endoparasite in the human intestine. Tapeworm enters in pig by feeding on garbage and human excreta having oncospheres. Oncospheres are released in the intestines of pigs. The shell dissolves and the hexacanth larva is liberated. The hexacanth larva is activated by bile salts. It reaches muscles and forms cysticercus. So, option A is correct.