Which of the following is an argument that sophisticated proponents of state intervention in the economy might make?
A. Sometimes only the state can solve problems coordinating the efficient allocation of capital
B. For markets to work, we need effective political institutions so that people can manage risk and uncertainty
C. If the state doesn't invest in human capital, others are unlikely to do so as effectively, and in the absence of human capital investment everyone will be economically worse off
D. All of the above