One U. S. poster from 1917 shows a motherly woman and the words, “Women! Help America’s Sons Win the War”. Explain its message, purpose, and emotional appeal. What role does the woman play? How does the poster function as a piece of propaganda?

The message is saying that the women don't have nothing to do and that even they can help win the war. The emotional appeal is that most women did have sons fighting and of course they wanted their children to come home safe. The woman plays the role of encouraging and helping the "boys".

Explanation:

the answer is use of support  

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.