During the final years of World War II, how did the Allies gain control of the Atlantic Ocean?

The Allies gained the upper hand in the Battle of the Atlantic by improving their ability to detect and attack German U-boats. Technologies such as radar and sonar, along with better escort ships and aircraft, helped protect convoys and sink submarines. This makes “They used better antisubmarine technology” the correct choice; Allied U-boats were not the main means of defeating Germany’s submarine threat.

AI-written and checked against the verified answer.