Which of the following changes could create a more negative (or, equivalently, a less positive) output gap for the U.S. economy? (i) The United States places additional (higher) tariffs on imports. (ii) Foreign countries place additional (higher) tariffs on U.S. exports. (iii) There is a reduction in availability of money or credit from U.S. banks and lenders (to U.S. borrowers). (iv) U.S. consumer pessimism increases. (i), (ii), (iii) and (iv) (ii), (iii) and (iv) (iii) and (iv) O (i) and (ii)