A. In developed countries “food waste” happens more at the consumer household level, where more is purchased than consumed.
B.As an example, India’s cold storage requirement is 66 million tonnes, and the national storage capacity currently available is approximately 30 million tonnes.
C. And in emerging economies, it is the supply chain that leads to “food loss” during harvest, storage or in transit, largely due to poor infrastructure and inadequately aligned processes.
D. Investment in creating adequate cold storage capacity alone will stem food loss substantially.

A is correctly placed first, as it starts the discussion by letting us know the way ‘food waste’ happens in developed countries. Clearly B is out of place at second place and the place should be occupied by C. C starts with the joiner ‘and’, which is used to add more information; also, it tells us about the way food is lost in developing countries. B should come third giving us the example of India, an emerging economy, where food is lost due to shortage of storage to store food grains. D comes fourth, correctly placed, telling us about the solution to wastage of food grains due to shortage of storages. BC is the pair to be interchanged. Hence, option D is the correct answer.