In the 1800s, about how many russians were”serfs” who had to work the lands for masters

Before the Great Emancipation of 1861, 10.5 million serfs were privately owned, 9.5 million were owned by the State, and about 900,000 worked for the Tsar himself.

c. more people could read and interpret the bible for themselves

the answer is a or the 1st option:  

the heads of the inquisition felt it was offensive, unfocused, and blasphemous.

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