49. Which of the following statements is true? (A) The once held superstitious belief that a solar eclipse foreshadows a terrible disaster is now confirmed to be true. (B) It is difficult to collect donations from private sectors after a serious disaster. (C) The worst part of natural disasters is that heavy rains brought by storms are often accompanied by volcano eruptions. (D) In the wake of natural disasters, governments all over the world are seeking consensus to establish warning systems.