Correct answer is 2. Have declined since the 1940's. For the second question answer is 2 also, petroleum, automobiles tc.

U.S. tariffs on imported goods: 1) have steadily increased since the 1970s. 2) have declined since the 1940s and are currently around 5 percent. 3)are currently around 20 percent. 4)are illegal. 2.The largest goods imports of the United States (in dollar volume) are: 1) chemicals, consumer durables, aircraft, and grain. 2) petroleum, automobiles, metals, and household appliances. 3) iron and steel, clothing, electronic equipment, and sugar. 4)aircraft, paper products, television sets, and furniture.