Questions 18-20 are based on the following monologue introducing the consequences of the Gulf War. You now have 15 seconds to read Questions 18-20. What are the officials puzzled at now

A．How to restore the normal production of the oil wells.
B．How to estimate the losses caused by the fires.
C．How to remove the oil left in the desert.
D．How to use the oil left in the oil lakes.