In which year of First World War Germany declared war on Russia and France?

The correct answer is A. 1914.

Germany declared war on Russia on August 1, 1914, and on France on August 3, 1914. This was the start of World War I.

Option B is incorrect because Germany declared war on Russia in 1914, not 1915.

Option C is incorrect because Germany declared war on France in 1914, not 1916.

Option D is incorrect because Germany declared war on Russia and France in 1914, not 1917.