Causative agent and vector responsible for African sleeping sickness

The correct option is B Trypanosoma gambiense carried by Glossina palpalis
Human African trypanosomiasis is also known as sleeping sickness. It is a vector-borne parasitic disease. It is caused by infection with protozoan parasites belonging to the genus Trypanosoma gambiense. They are transmitted to humans by tsetse fly (Glossina Palpalis) bites, which have acquired their infection from human beings or from animals harboring the human pathogenic parasites. Hence, option B is correct.