![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
Average tariff levels in the United States in the last decade are
A.
about equal to the average since 1930.
B.
above the average since 1930.
C.
positive, but below the average since 1930.
D.
zero, as there are no longer any tariffs in the United States.