Answer:
union leaders negotiating on behalf of a group of workers
It's a because during the middle ages kingdoms conquer other nations by the numbers as soon as the child has education he (I say he because they didn't allow women to have education back then) he will enlist into one of the European nations and fight.
A. Partitition of India and Pakistan
B. Establishment of the caste system
C. British colonization of the Indian subcontinent
D. Gandhi's Salt March
In order: B-C-D-A