The reason is because Document Ais the primary source written to the king.
<u>Explanation:</u>
Document A is said to be reliable source which helped to understand what had actually happened when Moctezuma had met Cortes. This was considered to be a reliable source because this was the primary source which was written to the king Charles V.
Because it was a primary source, it was obviously a reliable source. This document was a letter written to the king which described the meeting of the two.
The peasant revolt following collectivization of agricultural lands was an anti-communist uprising supported by Western democracies that feared collectivization would push the Soviets ahead of them. The holomodor involved deliberate starvation of masses in Ukraine to push them into communism submission.