What's the main point of the report?
A.
Obama says Mandela is not only his personla hero but also a hero for the world.
B.
Obama is going to meet with the Mandela family instead of Nelson Mandela.
C.
President Obama may noot get a chance to see Nelson Mandela on his trip to South Africa.
D.
The trip is bittersweet because President Obama cannot pay tribute to the man he calls a hero to the world.