What gave the allies an advantage at the battle of coral sea

The code breakers were able to warn of the planned Japanese attack and this gave the allies the advantage at the battle of coral sea.The allies were able to predict the plans of Japanese attack and invasion beforehand and this helped the Allies to make their plans accordingly. The Japanese were very surprised at the response they got from the allied forces and the response from the allied forces also damaged vital aircraft carriers of the Japanese army as well. 

The answer b is correct this all occurred during the red scare