The primary sources of the letter from a soldier on the front lines during World War II. Thus, the option (b) is correct.
What is primary sources?
An original material or document of the raw material or first-hand information is called primary sources. The primary sources are the first time collection of the data.
The Second World War, when compared to the First World War, was the largest war in recorded history. The letter of the soldier serves as one of the key sources for the years 1939 to 1945 of World War II. After World War II, her family's personal connection to the military was the military.
As a result, the primary source of the during the World War II front lines of the letter of the solider. Therefore, the option (b) is correct.
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