Need help on edge assignment How did the civil service exams help make Chinese society more stable?

They reduced the power and influence of emperors.
They removed unnecessary jobs in the bureaucracy.
They prevented dishonest individuals from serving in government.
They identified who was most qualified to hold government jobs.

Which suggests the most critical aspect of the peak oil theory? 1) controversy rages over rumors that the fracking lobby in washington has influenced the statistics. 2) supporters and critics argue endlessly over the rate of extraction and shape of the bell curve. 3) saudi arabia will soon have to begin fracking, leading to protests and further destabilization. 4) a new oil discovery means a fresh peak cycle, making that region the target of aggressors.