Answer: D)- Background on the production of airplanes during World War II
Explanation:
Victory through Air Power seems to be related to the use of airplanes during wars to defeat the enemy.
It would therefore be logical that the section would talk about how countries could go about doing so and include details about the planes that would enable such ambitions. A background on the production of planes during a war such as WW2 would therefore be the most likely to be included here.