What tectonic plate sits underneath the Atlantic Ocean immediately east of the continent of South America?

Question

Two tectonic plates and small corners of two others lie under the African continent. These are the African Plate, part of the Eurasian and the Arabian Plates and which other?

Answer 1

South American Plate
The African Plate lies further eastward. The Nazca is to the west of the continent, the Caribbean to the north.