What body of power became the highest body in the USSR after the outbreak of the war?

The supreme governing body was the Headquarters of the Supreme Command (answer “a”). It was created at the beginning of the Great Patriotic War. Its head was Stalin. Everyone was obliged to carry out the orders of this body. The main task of the Headquarters was to develop strategies for waging war. Until May 1945, all forces of the Headquarters were concentrated on the fight against the fascist invaders. Since May 1945, the Headquarters began to develop a strategy for the war against Japan.