nelson mandela loved learning. his formal education consisted of
being formally schooled in a bantu school by nuns.
attending grade school, high school and earning a college degree.
little more than being trained by the tribal leaders.

Attending grade school, high school and earning a college degree is the correct answer.

The others are incorrect
Bantu education was horrid and it didn't start until it was passed in 1953.
The last choice cannot be correct because his education lasted through college.