Who is the author of the book Principia Mathematica?
A. Issac Newton
B. Albert Einstein
C. Copernicus
D. Galileo
A. Issac Newton
B. Albert Einstein
C. Copernicus
D. Galileo
B. Then
C. than
D. from
A. Adam Smith
B. John Stuart Mill
C. Karl Marx
D. Milton Friedman
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