Cuba Spends the Highest Percentage of GDP (18

Cuba spends the highest percentage of GDP (18.7 percent) on education while the United States is the 38th highest spender with 5.7 percent of GDP. If spending on education is important for economic growth, which of the following statements explain why Cuba's economic growth rate is lower than the U.S. economic growth rate? (data from United Nations Human Development Programme)

A) Cuba trades with many more countries than does the United States.
B) Cuba doesn't offer property rights that promote innovation.
C) Cuba's population is smaller than the U.S. population.
D) all of the above explain why Cuba's economic growth rate is lower than the U.S. economic growth rate.