(A) Marched into Luxembourg
(B) Issued a threat to Russia
(C) ** Invaded Belgium
(D) Declared war on France
EXPLANATIONS BELOW
Concept note-1: -Of course, Belgians refused to let them through, so the Germans decided to enter by force and invaded Belgium on Aug. 4, 1914. By doing so, they violated the Treaty of London, which is why Great Britain, that was bound to guard the neutrality of Belgium, entered the war.
Concept note-2: -Antagonism with Germany The German invasion of Belgium was not the real cause of war with Britain, because the British decision had already been made as the British were more concerned with the fate of France (pp. 457–62).
Concept note-3: -German invasion of Belgium in 1914 did not necessitate a war between the two powers but was adequate in qualifying in the minds of the British the nature of the threat that lay ahead should victory be found by the Germans.
Concept note-4: -Britain declared war on Germany on August 4th 1914, but rivalry between the two countries had been growing for years. Germany resented Britain’s control of the world’s oceans and markets, while Britain increasingly viewed a Europe dominated by a powerful and aggressive Germany as a threat which must be contained.
Concept note-5: -With no response given late on 4 August 1914, Britain declared war with Germany and officially entered the war on the side of the Allies.