Figure 9-5 The Figure Illustrates the Market for Tricycles in a Country

Figure 9-5
The figure illustrates the market for tricycles in a country.
-Refer to Figure 9-5.Bearing in mind that this country is "small," which of the following events conceivably could cause the country to switch from being an importer of tricycles to an exporter of tricycles?

A) Incomes of domestic citizens increase,and tricycles are a normal good.
B) Within this country,the price of a substitute for tricycles decreases.
C) Within this country,the price of a complement to tricycles decreases.
D) Wages increase for domestic workers who produce tricycles.