Correct answer choice is :
C) Primary source document
Explanation:
In the study of history as an educational rule, the main supply is an object, document, diary, manuscript, life, recording, or the other provide knowledge that was produced at the time below study. It is an inspired supply of knowledge regarding the subject. Although several primary sources stay in camera hands, others are put in information, libraries, museums, historical societies, and special collections. These may be public or non-public. Some are linked with universities and schools, whereas others are government organizations.
The Yalu River also known by Koreans as the Amrok River or Amnok River. It is a river on the border between North Korea and China.
A candidate from a split party typically doesn’t win the presidency and a contested convention doesn’t create momentum that a candidate needs to oppose the other party
The United Nations. They also helped prevent any more world wars.