Which of the following contributed most to the massive decrease in the population of european jews that occurred before and during world war ii?
the invasion of the soviet union
the zionist movement
the nazi's final solution
the london blitz

The Nazi's Final Solution contributed mostly to the massive decrease in the population of European Jews that occurred before and during World War II. This was a time when Adolf Hitler ordered massive segregation and killing sprees for Jews to cleanse society of impure beliefs. A lot of innocent lives were taken, men, women, and children. This was to be known in history as the most brutal form of religious movement.