Included Belgium, France, Luxembourg, Montenegro, Russia, Serbia, and the United Kingdom. Greece, Italy, Portugal, and Romania began as neutral nations but later joined the Allied powers. The Central powers included Austria-Hungary and Germany. Bulgaria and the Ottoman empire began as neutral nations but later joined the Central powers. Albania, Denmark, the Netherlands, Norway, Spain, Sweden, and Switzerland were neutral nations.

Use the map to answer the question.
Which situation shown on this map shaped Germany's military strategy in World War I?

A.
the alliance between Britain and France

B.
the alliance between France and Russia

C.
the neutrality of Switzerland and the Netherlands

D.
the absence of a German port on the Mediterranean Sea