On which of the following railway stations of South Africa, Mahatma Gandhi was thrown out of the train?

The correct answer is (b), Pietermaritzburg.

Mahatma Gandhi was thrown out of a train in Pietermaritzburg, South Africa, on June 7, 1893. He was traveling from Durban to Pretoria to take up a job as a lawyer. When he refused to give up his seat in the first-class carriage to a white man, he was thrown off the train at Pietermaritzburg station. This incident sparked Gandhi’s lifelong commitment to non-violent protest against racial discrimination.

The other options are incorrect. Johannesburg is the largest city in South Africa.