Suppose Ecoland initially had real GDP equal to potential GDP. Then, if we observe average prices are rising and unemployment is decreasing, which of the following could have caused that? Select one: O A. citizens of Ecoland were required to pay lower income tax. O B. Ecoland's currency appreciated O C, the interest rate increased in Ecoland O D. investors in Ecoland became less optimistic O E. technology improved in Ecoland Next page