Russian cossacks can be compared to
a. north american westward settlers.
b. japanese serfs.
c. african slaves.
d. chinese peasants.

Generally speaking, Russian Cossacks can be compared to "A. North American westward settlers," since both of these groups of people were extremely autonomous and independent, even though they belonged to a specific nation. 

Asuffragette was a member of militant women's organisations in the early 20th century who, under the banner "votes for women", fought for the right to vote in public elections, known as women's suffrage.