Answer:
3. Citizens back home resorted to creating innovative ways of making food and crops last longer due to lack of manpower and funding.
Step-by-step explanation:
During world war, the large portion of production in the country shifted to accommodate the needs of the military. For example, there were many companies who operated in other industries shifted their production to weapons , airplanes or tanks.
Food was also one of the industries that was forced to adapt.
The situation create an overwhelming demand for foods that are easy to carry, and can last a really long period of time (since the soldiers have to carried it out on the battlefield) . This attract many companies to conduct agricultural research and development in order to invent those type of products.