Respuesta :
In addition to weaponry, communication, and medicine, the war time industries that had significant technological breakthroughs were "c. airplanes, farming" since both of these were crucial to the war effort.
I believe the answer is: c. airplanes, farming
During the wartime, airplanes industries managed to develop the technology that allow the planes to move at higher elevation and speed, which would give a competitive advantage during the war.
The development in farming revolve around their preservation technique, which made is easier for the government to prepare the meal supply for their soldiers.
