Which sentence from “Yellow Fever” can be defined as an effect?
A
Although scientists are not certain where and when yellow fever began, they believe the first cases were in Africa.B
Not all mosquitoes carry this disease, and some mosquitoes actually get it from biting an infected person.C
The next stage can include high fever, internal bleeding, unconsciousness, and harm to the heart, liver, and kidneysD
They believed that yellow fever was spread by germs from unclean air or contact with dirty linen.