In the first part of the 20th century, apart from Darwinism, which was still a big influence upon the writers of this period, there were two thinkers __A___ whose ideas had the greatest impact on the period.
A.
the German Karl Marx and the American Sigmund Freud
B.
the German Karl Marx and the Austrian Sigmund Freud
C.
the Swiss Car Jung and the American William James
D.
the Austrian Karl Marx and the German Sigmund Freud