Final answer:
Adolf Hitler adopted anti-Semitism as a German government policy because he blamed the Jews for Germany's economic and social problems that arose after World War I. His belief in the Aryan master race also contributed substantially to his anti-Semitic ideologies. His fear of the political power of Jews or the Zionist movement was secondary in his approach.
Step-by-step explanation:
Adolf Hitler, the infamous German leader, implemented anti-Semitic policies primarily because he blamed Jewish people for Germany's socio-economic hardships following World War I. Hitler's ideology, rooted in a flawed understanding of race and genetic superiority, led him to ambitiously promote the notion of an Aryan master race. He considered Jews to be racially inferior and detrimental to what he considered 'pure' German society, often characterizing them as a scapegoat for most of the challenges that Germany faced post-WWI, including economic instability and the conditions of the Treaty of Versailles.
This does not necessarily mean he believed Jews had immense political power in the somewhat fragile Reichstag or that he feared the Zionist movement turning Germany into a Jewish state. These were secondary aspects compared to the primary anti-Semitic sentiment established in Hitler's ideology.
Thus, Option A: He blamed the Jewish people for the economic and social problems in Germany after World War I aligns the most with historical evidence.
Learn more about Hitler's anti-Semitism