The correct option is D Entamoeba histolytica
Monogenetic parasites complete their life cycle within a single host whereas a digenetic parasite requires two hosts to complete its life cycle.
Entamoeba is monogenetic with humans as the only host.
Plasmodium vivax is digenetic with the female Anopheles mosquito and the humans as hosts.
Trypanosoma gambiense is digenetic with the Tse tse fly and mammalian hosts like humans.
Taenia solium is also digenetic with pigs and humans as the hosts.