After reading the review of the book Schindler's Ark and meeting Pfefferberg in 1983, Spielberg expressed enough interest in putting the story into a film. But later he tried to pass the project to other film directors. Why?

A、Because Spielberg was taking on another Holocaust Drama then.;
B、Because Spielberg’s mother was killed during the Holocaust.;
C、Because Spielberg was worried that the topic would cause controversies.;
D、Because Spielberg was not sure whether he was good enough to make the film.