Respuesta :
The Breakthrough which helped the United States to win the battle of Midway was by breaking the Japanese military codes, hence correct Option is A.
Battle of Midway
After the Pearl Harbor, the Battle of Midway was the most important battle between US and Japan. According to Historians, during World War 2 the Japan's fleet was widely dispersed, for communication they were totally depended on Radio.
American Navy and Air Forces successfully begun to break communication code from around 1942, thereby they knew when Japan will attack and at what place in advance. Therefore, the correct option is A breaking Japanese Military Codes.
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