The energy crisis has been with us for a long time and will be with us even longer. Whether Arab oil flows freely or not , it is clear that the world industry cannot be allowed to depend on so fragile, a base. The supply of oil can be shut off at whim any time. In any case, the oil wells wil run dry in about 30 years. New sources of energy must be found and this will take times. But it is not likely to restore that sense of copious energy availbility we had in the past .
The phrase 'so fragile a base' refers to the

Options

A. current energy cirsis in the world
B. uncertainly about the flow of Arab oil
C. delay in finding the new energy sources
D. drying up to the oil wells in future

Answer

B