Is A I took the test hope this helps ;)
The National War Labor Board was authorized in March 1918 for the purpose of preventing strikes that would disrupt production in war industries. The first appointments were made the next month. ... After the war, the work of the National War Labor Board was praised by progressives.
hope this helps!!!
Answer:
The large number of groups could lead to ethnic tensions.
Explanation:
I would say the answer is B
