The correct option is D Racial Discrimination
In South Africa, on a journey by train from Durban to Pretoria, he was forcibly thrown out of a first-class compartment, even though he had a valid ticket. Gandhiji was hurt by the racial injustice and discrimination to which Indians had to submit in South Africa. He started his non-violent civil disobedience movement to protest against the discriminating treatment meted out to Indians. Thus, it was during this struggle that Mahatma Gandhi evolved the technique of satyagraha (non-violent resistance) based on truth and non-violence.