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 t 38th highest spender with 5.7 percent of GDP.
(data from United Nations Human Development Program
If spending on education is important for economic growth, which of the following statements expla Cuba's economic growth rate is lower than the U.S. economic growth rate?

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