Answer:
Wartime Production
President Wilson created the War Industries Board to set production standards and coordinate railroad and shipping efforts. The National War Labor Board secured the cooperation of American workers by setting higher wages and an eight hour workday, and recognized the right
Susan B. Anthony was a social reformer and women's rights activist who devoted her time to the women's suffrage movement.
I may be wrong but I'm pretty sure it's B, because the Vietnam War reunified Vietnam into a single communist country, so C and D are out, and Cambodia was involved in the war, so that takes A out too, so only B remains.