Which of the Following Factors Is Most Correct

Multiple Choice

Which of the following factors is most correct?

A) Demand-pull inflation traditionally exists during periods of economic expansion when the demand for goods and services exceeds the available supply of such goods and services.
B) Cost-push inflation occurs when prices are raised to cover rising production costs, such as wages
C) Speculative inflation is caused by the expectation that prices will continue to rise, resulting in increased buying to avoid even higher future prices
D) All of the above are correct