I believe the answer is: c. Americans feared that other foreign powers would gain power if the United States did not get involved.
At that time, the soviet union was known to give military aid to Cuban revolutionaries against the Spanish government. United States see this as a threat that might spread communism influence to south America, so they decided to also get involved in the revolutionary.
You answer is c ,the passage of new amendments to the constitution
The dissolution of the union began in the 1980s
The language of the document is often extreme; statements have all or nothing connotations. The argument appeals more to the emotions than to logic. Things are worded with the intent to oversimplify or over generalize.