Many latin american countries in the twentieth century turned to
a. democracy and autocracy.
b. monarchy and self-government.
c. communism and socialism.
d. fascism and despotism.

Many Latin American countries in the twentieth century turned to  "communism and socialism".

Socialism is generally viewed as an economic framework that looks to accomplish equity among individuals from society. Communism, is both an economic framework that looks for correspondence among individuals from society and a political philosophy that advocates a classless and stateless society and rejects religion. It is viewed as a more extraordinary type of socialism.  

Communism and socialism both cling to the rule that the assets of the economy ought to be all things considered possessed by the general population and controlled by a central association.

so, based on the research i've done. the u.s. government were always on a wild goose chase just to take down castro. he then retired his trone to his brother raul in 2008 due to some health issues. so it's obvious your answer would be:

castro had no allies from which he could receive aid.

hope this and have a fantastic day!

                                                    -wolfiewolffromsketch