Which of these events happened in the 20th Century?

Question

Responses
A Tutankhamen becomes the leader of Egypt.Tutankhamen becomes the leader of Egypt.
B Bartholomew Diaz lands on the Cape of Good Hope.Bartholomew Diaz lands on the Cape of Good Hope.
C Nelson Mandela becomes the President of South Africa.Nelson Mandela becomes the President of South Africa.
D They pyramids are built along the Nile River in Egypt.

Answer 1

C Nelson Mandela becomes the President of South Africa.