The second alternative is correct (B).
The Final Solution was a plan drawn up by the Nazis aimed at exterminating the Jews of Europe.
It was a plan for the destruction of Jews, whether by gas poisoning, firing, random acts of terror, or disease and starvation. This was the greatest horror ever experienced by the human species.
By the end of the Second World War, as a result of the Nazi plan, six million Jews had been murdered, which is equivalent to two-thirds of all Jews living in Europe before the Nazis came to power in Germany.