How long was Nelson Mandela imprisoned for his fight against apartheid?

Twenty-eight years

The correct answer is Option 3 - Twenty-eight years 

Mandela spent 28 years in jail for his fight against apartheid.

The autobiography of one of the greatest persons of the twentieth century, Nelson Mandela, is titled Long Walk to Freedom. In this book he talks about his personal struggle against the apartheid regime in South Africa, about the resistance of his people to the segregationist policies of the white regime, about the humiliations, hardships and police brutalities suffered by the black people of South Africa. These ranged from being bundled into townships and being denied easy movement about the country, to being denied a free choice of whom to marry. Collectively, such measures constituted a body of constraints imposed by the apartheid regime that discriminated between citizens based on their race. For Mandela and his colleagues it was the struggle against such unjust constraints, the struggle to remove the obstacles to the freedom of all the people of South Africa (not just the black or the coloured but also the white people), that was the Long Walk to Freedom. For this freedom, Mandela spent twenty-eight years of his life in jail, often in solitary confinement. For freedom Mandela paid a very high personal price.