Question 53-54 refer to the following information.An earthquake of magnitude 6.1 struck southwestern China on Sunday, resulting in the death of nearly 600 people in a remote area of Yunnan province as well as collapse of thousands of building, including a school. The earthquake also triggered more landslides that have blocked rivers and created rapidly growing bodies of water that could unleash more destruction on survivors of the disaster. More than 10000 soldiers and hundreds of volunteers have rushed to Ludian Country to clear roads and dig out possible survivors from the debris, but landslides and bouts of heavy rain havecomplicated rescue efforts. An estimated 80000 houses were destroyed and 12400 seriously damaged.Which of the following statements is true according to the passage?
A. Landslides have brought about more destruction on the survivors.B. It is soldiers who have undertaken a huge proportion of relief work.C. The rescuing work has been going on quite smoothly with no interference.D. The rain and the Landslides have added to the difficulty of rescue efforts.