In the 18th century and thereafter, the jewish population of europe was concentrated

Poland, Lithuania, and Ukraine

Explanation:

In the 18th century, the Jewish population concentrated in countries like Poland, Lithuania, and Ukraine in Europe. During the end of the 17th century, Poland had the highest number of Jews. Today, the majority of Jews across the world could follow their ancestry to this region. During the Polish–Lithuanian Commonwealth, Jews were 50 % of the urban population. Jews enjoyed extensive freedom and economic prosperity.

the answer is b your welcome : )

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