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Option 1 includes India, China, Pakistan, Brazil, Bangladesh, and Indonesia as the six countries with half of the world`s population.
Option 2 includes India, China, Bangladesh, South Africa, Pakistan, and Indonesia. South Africa is not one of the countries with a large population, so this option is incorrect.
Option 3 includes China, India, United States, Indonesia, Brazil, and Pakistan, which are the six countries with half of the world`s population. This matches the correct answer.
Option 4 includes China, India, Bangladesh, United States, Pakistan, and Indonesia, which are the correct six countries with half of the world`s population. This also matches the correct answer.
Therefore, both option 3 and option 4 correctly identify the six countries with half of the world`s population.