Why is this propaganda poster from 1917 encouraging Americans to "plant and raise" vegetables?

Question

Responses
A The United States was at war against Japan.The United States was at war against Japan.
B There was a lack of farmers in the country.There was a lack of farmers in the country.
C All available food was needed to support the war effort.All available food was needed to support the war effort.
D The Dust Bowl had destroyed most farmland in the United States.The Dust Bowl had destroyed most farmland in the United States.

Answer 1

The correct response is:

C. All available food was needed to support the war effort.

During World War I, the U.S. government encouraged citizens to grow their own vegetables to help supplement the food supply and ensure that enough food was available for troops and allies. This was part of a larger effort to maintain morale and support the war effort.