Answer:
Probably A.
Explanation:
The Articles did not have separation of powers. It could possibly be B, because the constitution let the federal government tax whereas the the Articles would not also the articles let the states trade internationally, whereas the constitution gave the federal government the control over international trade. But I personally am leaning towards A.
Had to look for the missing details and here is my answer.
The area that is generally considered by Ronald Reagan as the most positive legacy is the COLD WAR. The Cold War actually happened right after the World War II. What occurred during this time was that there was a tension between the powers of the West and the East. Ronald Reagan actually served as the 40th President of the United States and he was active during this event. Hope this helps.
A - Because they are a direct link to the events in history
Primary sources are sources that came from that time of history from the same location, time period, and era. For instance, journals from World War II from a French Military leader. These are direct links to that time in history and are the most accurate sources that are presented.
B is incorrect as even without these sources there are other methods to know about history such as secondary sources.
C is incorrect as primary sources are not the only way - again, secondary sources are a thing.
D is incorrect as secondary sources are reliable and can be trusted, but they just aren't as important and well, direct as primary sources.
Hope this helps!