Question

Which of the following was directly caused by Germany's invasion of Belgium?

Russia mobilized its troops for war.
Germany declared war on Russia and France.
Britain declared war on Germany.
Germany attacked Luxembourg.

Answer 1

Britain declaring war on Germany was caused by Germany's attack on Belgium. Britain wanted to protect Belgium(which was a neutral country). Also, because Belgium is close to France (who was very weak at the time) and the British wanted to prevent a French defeat.