The correct options are
A The battle kept British superiority intact in the Baltic sea.
B The battle was fought in the North Sea, near Denmark.
C This battle would eventually become the reason for Germany's use of U-boats.
The Battle of Jutland was fought on the west coast of Jutland, Denmark, in 1916. Britain suffered heavier losses in terms of ships and lives, but the balance of power in European waters had not essentially changed. The British still dominated the North Sea. The German High Command was notified that further fleet action was not an option, and that submarine warfare, i.e., the use of U-boats was Germany’s best hope for victory at sea from that point on in the war.