Looking at the Average Tariff Rate in Australia Since 1930

Multiple Choice

Looking at the average tariff rate in Australia since 1930, we see that

A) while we talk about free trade, tariff levels have risen over the last 30 years.
B) at first tariffs declined, but have recently risen.
C) tariff levels have remained high at over 50 per cent throughout the period.
D) tariffs have trended downward since the early 1930s.
E) tariffs have trended downwards since 1947.