Final answer:
Papua New Guinea is the country not located in Africa; it is in the southwestern Pacific Ocean and part of Oceania.
Step-by-step explanation:
The country that is not in Africa is (d) Papua New Guinea. While Guinea-Bissau, Guinea, and Equatorial Guinea are all located on the African continent, Papua New Guinea is an independent country located in the southwestern Pacific Ocean, north of Australia.
It is part of the region known as Oceania and it is not associated with the African continent.