The theater of war against Germany and France, who were the main belligerents on the Western front, led to the beginning of the World War in these regions.
How did World War begin on the Western front?
Countries like Germany and France were at the border of the Western front and their armies had to be involved in the World War I, as it began, followed by the outburst of theater of war in August 1914.
Germany and France had the bigger impact during this theater of war as they were located at western front when of the European war at the time of beginning of the World War.
Hence, option D; correctly describes the theater of war after the World War I began on the Western front, with Germany and France as the main belligerents.
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