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In the context of how Hitler used anti-Semitism to increase his power, the correct answer is:
B. He fed German belief that Jews were responsible for the loss of World War I, which caused the ills of the country.
By blaming the Jewish population for the country's defeat in World War I and the subsequent economic and social problems, Hitler was able to exploit existing prejudices and incite hatred towards Jews. This tactic allowed him to rally support among the German population by presenting himself as the solution to their perceived problems, thus increasing his power and influence.
I hope this explanation helps you understand how Hitler utilized anti-Semitism to consolidate his power. If you have any more questions or need further clarification, feel free to ask!