The famous UNESCO heritage site, Robben Island served as the political prison of which of the following leaders?

Nelson Mandela

The correct answer is Option (4) → Nelson Mandela

Out of the choices you provided, Robben Island was the political prison for:

• Nelson Mandela (South Africa)

While the other leaders might have been imprisoned elsewhere for political reasons, Robben Island is most associated with Nelson Mandela's imprisonment during the apartheid era in South Africa.