Question

The main message of the poster is that
women in noncombatant military jobs were important to winning the war.
female workers were patriotic and made the best military typists.
women could work in any job they chose during the war.
female workers could single-handedly win the war.

Answer 1

women in noncombatant military jobs were important to winning the war.

Reason: wartime posters typically stress the essential support role women filled (clerical, technical, nursing, etc.) to persuade recruitment and highlight their contribution—not that they alone won the war, that they were limited to typist roles, or that they could pick any job without restriction.