Gandhi did not welcome the idea of being a mute spectator to the atrocious behaviour of the whites towards the non-whites in Africa.

Answer: Option B

Atrocious : horrifyingly wicked.
Gracious : courteous, kind, and pleasant, especially towards someone of lower social status.
Noble : having or showing fine personal qualities or high moral principles.
Civilised : bring (a place or people) to a stage of social and cultural development considered to be more advanced.
Pleasing : satisfying or appealing.

Antonym of Atrocious is Noble