This poster could be used to support which assertion? А.
Use of new war technologies required extensive training.
B
Conscription caused a shortage of laborers during wartime.
С
Demand for labor in war industries helped increase
employment
Standardization of parts helped streamline the production of
munitions.

С . Demand for labor in war industries helped increase  employment

Explanation:

The poster claims that jobs people do on the homefront can claim the victory. These jobs would include the production of goods for the military, ammunition, clothes, tanks, transport, etc.

The industry during the war was in high demand as the military on the fronts demanded plenty of things, but there were still needs of people at home that had to be met. Therefore, there were many available jobs. Not only men who stayed home were well employed, but women started getting jobs in the positions vacated by men who fought in the war. This created job opportunities for many and increased the number of employed people much more than before, especially since for the first time in history so many women have been employed in various positions.

the three answers (for plato at least) are:

b-condemned sola fida 

d-set rules for establishing seminaries and for educating clerics in the seminaries 

f-recommended moderation in the sale of indulgences and banned the sale of false indulgences 

he killed a bunch of jews so no one was spending money and the stock market rose again