My answer to this question would be A.
The correct answer is “they”. They is the only plural noun in the right context, considering the sentence is talking about two people.
Answer:
It details the origins of the infection in China, and its spread via human trafficking, refugees, and the organ trade. Governments of the world ignore it until a public outbreak occurs in a South African shantytown, leading to Israel unifying with Palestine and closing its borders.
Answer:
Animals have different habitats.