What area did Bartholomeu dias explored or discovered?

Bartolomeu Dias, also called Bartholomew Diaz, was a Portuguese navigator whose discovery in 1488 of the Cape of Good Hope showed Europeans there was a feasible route to India around the storm-driven southern tip of Africa

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )