Final answer:
After World War I, the British promised India steps toward self-government in return for military service.
Step-by-step explanation:
After the British colonized India and World War I began, the British promised India steps towards allowing self-government in return for military service. This promise was made through the Montagu-Chelmsford Reforms in 1919. The British recognized the need to appease nationalist sentiment in India and thus pledged to gradually introduce self-government and greater representation for Indians in the governing process.
Learn more about British promises to India after World War I