Despite Many Differences, the Market and Public Sectors Are Similar

Despite many differences, the market and public sectors are similar in which one of the following respects?

A) In both sectors, income (or power) is distributed on the basis of the same criterion.
B) Consumers in the market sector and voters in the public sector are equally well informed.
C) Voluntary exchange, rather than compulsion, is characteristic of both sectors.
D) It will be costly to use scarce goods, whether through the private or the public sector.