The lack of rain during the last 36 months has reduced the water level of the Mississippi River and the Ohio River. As a result, the ships and barges that transport farm products along these rivers have reduced their loads and made more fequent trips. This situation can be portrayed as a: A. Rightward shift of the demand curve for those farm products. B. Leftward shift of the supply curve of those farm products. C. Rightward shift of the supply curve of those farm products. D. Leftward shift of the demand curve for those farm products. E. Movement up and along the supply curve of those farm products.