Which of the following pairs is the best example of complements?

Governmental policy decisions have

(a) only social benefits. (b) no private costs. (c) intended and unintended effects. (d) no social costs.

Generally speaking, protection from foreign competition benefits:

a. both domestic producers and foreign producers. b. both domestic consumers and foreign consumers. c. domestic consumers and foreign consumers. d. neither domestic producers nor foreign producers. e. domestic producers at the expense of domestic consumers.