Correct Answer:
D. (D) 1939
The Second World War officially began in 1939 with Germany's invasion of Poland, leading to declarations of war by France and the United Kingdom.
The answer is D. 1939.
World War II is generally considered to have begun on September 1, 1939, when Nazi Germany invaded Poland. This event triggered declarations of war from Great Britain and France on Germany two days later.pen_sparktunesharemore_vert