单项选择题

Questions 7 and 8 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions.
Now listen to the news. Rescuers have been denied access into the building for the following reasons EXCEPT

A. the possibility of the building collapsing. B. the likely explosion from the gas tank.
C. the possible subsequent rockslides.
D. the noise and trembling at the moment.