To determine whether a piece of historical evidence is reliable, historians generally: a. determine whether the information supports their existing claims. b. simplify the information to make sure that nonhistorians can analyze it. c. develop rhetoric to convince others that the evidence is strong. d. check to see if the information in the source is confirmed by other sources .

i would go with the last one

payments were made after the 1940s.

in the 1980s, a commission held investigations and made recommendations.

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