The Debate About the Appropriate Balance Between the Public and Private

The debate about the appropriate balance between the public and private sectors

A) is about the marginal benefits of public spending versus the marginal benefits of private spending, received for the last dollar spent.
B) was solved by James Buchanan, a Nobel laureate.
C) should be decided by economists because they know the right balance.
D) has been solved in Canada.
E) was solved by John Kenneth Galbraith in his book The Affluent Society.