Answer:
b. of sleeping sickness in humans
Step-by-step explanation:
Tsetes flies are carriers of two different diseases in both cattle and humans. The tsetes flies infected by the parasite Trypanosoma brucei cause these diseases. Both the diseases can be used as parallelism expressions in a sentence when telling about different effects of bite of infected tsetes flies. The infected Tsetes flies cause nagana disease in cattle and sleeping sickness in humans.