Which of the following is not a challenge to the cuban economy?
a.
the country exports all of its products to the united states.
b.
the country’s economic system is inefficient.
c.
the country has severe shortages of consumer products.
d.
the country’s gdp and income are both very low.

The country's economic system is inefficient and this is not a challenge to the Cuban economy. The correct option among all the options that are given in the question is the second option or option "B". Cuba is a country that has long been under the rule of military dictatorship. This has definitely hampered the progress of its economy.