Which of the following best explains why secondary sources are important to historians?
a. they put historical events in the correct chronological order.
b. they are the least biased source available for any subject.
c. they summarize conclusions about primary sources.
d. they provide firsthand accounts of historical events.

C. They summarize conclusions about primary sources.

answer

the statement that best describes president carter’s attempt to free the hostages in iran is c. all of the attempts failed.

explanation

the operation eagle claw conducted by the united states armed forces was a failed mission which aimed to rescue 52 americans captured as hostages in the american embassy, tehran on 24/4/1980.the mission was authorized by president jimmy carter. the failures included;   obstacles in operation that included operational conditions challenges caused by sandstorms, hydraulic problems of one the helicopters and , mechanical failure of another helicopter that was identified as a cracked rotor blade and the crashing of another helicopter during mission abortion causing death of 8 service persons.