In April 2015, the U.S. Energy Information Administration projected that the average retail price for regular-grade gasoline would be $2.45 per gallon for the remainder of the year (the lowest average price since 2009). Indicate which of the following events might have triggered a decrease in gasoline prices O A. O B. ° C. The price of oil decreased substantially The supply of oil decreased The price of oil increased substantially. All of the above. D.