At the present rate of consumption, the oil wells run

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At the present rate of consumption, the oil wells run dry in 30 years and ................

1. new sources of energy must be found, but this will take time
2. new sources of energy could be found taking some time
3. new sources of energy will take time but has to be found
4. new sources of energy although taking time must be found

Correct Option: A

All other options have errors.