Who Has Proposed Which Solution to the "Tragedy of the Commons

Who has proposed which solution to the "tragedy of the commons"?

A) Functionalists propose the use of coercion to discourage the use of the commons.
B) Theorists adopting the collective goods approach propose taxing those who do not cooperate to restructure their preferences.
C) Federalists propose altering the size of the group so the commons will not be used as quickly.
D) Radicals propose creating a world government to force cooperation.
E) Theorists adopting the collective goods approach suggest increasing the commons to meet new needs.