Answer:
Historical documents are original documents that contain important historical information about a person, place, or event and can thus serve as primary sources as important ingredients of the historical methodology.
Explanation:
1 is c 2 is a 3 is d and 4 is d
B.
A is wrong because China got destroyed repeatedly during WWII.
C is wrong because the LoN turned a blind eye to Japan
D is wrong because the Western powers didn't care about China.