The answer is Annie Besant. She was a prominent member of the Fabian Society and actively promoted the ideas of Fabianism in her writings and political activities. She was a leading figure in the British labor movement and worked towards the establishment of a welfare state in the United Kingdom.

A. O. Hume was a British civil servant who played a key role in the founding of the Indian National Congress. Michael Madhusudan Dutt was a Bengali poet and playwright. R. Palme Dutt was a British communist politician. None of these individuals were proponents of Fabianism.