The photograph below was taken in the United States during World War II:

Image of people standing in a line on the sidewalk. The line includes a woman holding a baby, a man in uniform, and several other men and women of different ethnicities. A sign above the peoples heads reads, Shoes Rationing Board War Book 1 War Book 2.

Universal Images Group/ Image Quest 2015

Which describes the purpose of the action shown in the photograph?

to volunteer time to one of the newly formed war production industries
to control the use of raw materials needed for war materials
to increase the sales of consumer goods to raise money for the war
to encourage people to purchase war bonds to financially support the war