The correct option is B 70%
Man domesticates a variety of animals for food, transport, agricultural operations etc. Domestic animals which are kept for use and profit constitute livestock. Examples include buffaloes, cows, pigs, sheep etc.
As estimated, more than 70% of the world livestock population is in India and China. Contrary to this, the contribution to the world farm produce is just 25% which means that the productivity per unit is very low.