Which of the following was illustrated by the majority voting decisions witnessed during the Great Depression?

(a) If the U.S. wants to get the most from its resources, the pricing of goods and allocation of investment should be decided by majority voting.
(b) In a representative democracy, majority voting will assure that approved projects are productive.
(c) There are good reasons to expect that majority voting will sometimes result in the approval of projects that are inefficient.
(d) Private firms can force their customers to pay for products they produce, but the government cannot do so.