Explanation:

- During British rule in India, the primary source of livelihood for a vast majority of the population was agriculture. Most Indians depended on farming and related activities for their sustenance.

- Production: While industrial production did contribute to livelihoods, it was limited and primarily managed by the colonial rulers.

- Revenue: The term "revenue" refers to money brought in through various means, such as taxes or government income. It was vital for the government but not a direct livelihood for most.

- Banking: The banking sector was not as developed and served a very small segment of the population.

Agriculture was indeed the backbone of the Indian economy during British rule.