Based on the sequence of events in the graphic organizer, the events appear to be related to World War II.
- Battle of the Bulge - A major German offensive campaign launched through the Ardennes region of Wallonia in Belgium, occurring in late 1944 to early 1945.
- Increased Allied air attacks - Following the Battle of the Bulge, Allied air power would have intensified to counter the German offensive.
- ? - This box would logically represent a significant event or turning point following the increased air attacks.
- German surrender - This event occurred shortly after the turning point in early 1945, leading to the end of the war in Europe.
Given the context and the events related to World War II, the event that best fits as the turning point following increased Allied air attacks would be:
D-Day landings.
The D-Day landings (June 6, 1944) were a pivotal moment in the war that helped establish Allied superiority in Europe and set the stage for events leading to the Battle of the Bulge.
Thus, the correct response is D-Day landings.