The correct option is C Human faeces with onchospheres
Taenia solium is the most common tapeworms of human beings. Their larval stages involve pigs as intermediate hosts.
Whenever, the proglottid leaves in the feces of human, pigs consume them and the larval stage develops in the muscles of pigs. A person can become infected by these parasites by consuming raw or uncooked meat, pork or beef that has been infected by their larvae or oncospheres.
So, the correct answer is option C.