Unceasing, continuous, it cannot be defined, and r______(return) again to the realm of nothingness. (time: 8:34)

What does “The horror! The horror!” mean? （ ） A: Kurtz became aware of the evil and immoral events that he was involved in during his lifetime. B: “The horror” reveals that what Kurtz perceived is nothingness, the “hollowness” of his self and the brutal world. C: It reflects the blindness and sadness caused by the alienation and loss of self in modern society. D: Kurtz said it because he felt remorse for all the horrible things he had done throughout his life.