Because the united states has an embargo on a. the united states regularly increases the taxes on cuban imports b. cuba exports the majority of cuban products to american companies c. virtually no cuban products are legally available in the united states d. cuba must sell products directly to state governments in the united states.

Because the United States has an embargo on Cuba, virtually no Cuban products are legally available in the United States.

The United States embargo against Cuba (in Cuba called el bloqueo, "the blockade") is a commercial, economic, and financial embargo imposed by the United States on Cuba. 

The correct answer between all the choices given is the third choice or letter C. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

answer; i believe that the correct answer is (decreased)