Pls help me on this
What do the Montgomery bus boycott, the United Farm Workers strike, the American Indian Movement's occupation of Alcatraz Island, and the Asian Americans for Equality demonstration against discrimination in the construction industry have in common?
A. They helped win expanded civil rights for marginalized groups.
B. They helped lower the voting age to 18.
C. They are examples of the use of quota systems.
D. They involved landmark Supreme Court cases.