They were there against the civil right worker's murders. While the black population at the time was allowed to vote, in the Southern states they were withheld from voting by all sorts of idiotic reasons.
A and B are similar but, I would say the best answer is A.
Poland engaged in a democratic transition which put an end to the People's Republic of Poland and led to the foundation of a democratic government, known as the Third Polish Republic (following the First and Second Polish Republics). After ten years of democratic consolidation, Poland joined NATO in 1999 and the European Union in 2004.
#1 1712 – First steam engine is invented. ...
#2 1757 – British victory in the Battle of Plassey. ...
#3 1764 – Invention of the Spinning Jenny. ...
#4 1771 – Richard Arkwright opens his first factory at Cromford. ...
#5 1789 – Samuel Slater leaves for America. ...
#6 1794 – Eli Whitney patents the cotton gin.