Distribution of output relates to which central problem of an Economy?

For whom to produce

The correct answer is For whom to produce.

The central problem of "For whom to produce" in an economy deals with deciding who should receive the goods and services that are produced. This is an important issue because different groups in society have different needs and wants, and it is important to ensure that the goods and services that are produced are distributed in a way that meets the needs of all groups.

The other options, "What to produce", "How much to produce", and "How to produce", are all related to the production of goods and services. However, the central problem of "For whom to produce" focuses on the distribution of the goods and services that are produced.