After cuba lost economic aid from the soviet union, fidel castro

turned to other communist countries for .
changed the country’s system of government.
encouraged the united states to invest in the country.
allowed some economic reforms to occur.

allowed some economic reforms to occur

Explanation:

After the end of the Soviet Union, Cuba entered an era of economic hardship that was called "Special Period in Time of Peace". Cuban government developed more structured strategies to manage the long-term crisis while dealing with a strong opposition during that time which shifted a lot of ideological positions and cultural behaviors in Cuban society. Cuban government didn't to anyone else for help, specially the US, back then and for sure kept its dictatorial model which is the same today.

Its actually D: Allowed some economic reforms to occur

i think it was   tsar alexander ii

the deaths of over a million communist soldiers

post-traumatic stress disorder in veterans