The correct options are
B The wall was created by the British to separate eastern and western part of Germany.
C The western part of Germany was controlled by Netherlands, Britain, and France.
D The unified western region of Germany was called the 'German Democratic Republic'.
The Soviet Union had identified Eastern Germany as the 'German Democratic Republic'. The eastern part was under the United States, France, and Britain, and they unanimously recognised East Germany as the 'Federal Republic of German'. The Berlin Wall was built by Russia.