What caused this policy shift? A.
Germany attacked US military vessels sailing in European waters.
B.
Germany invaded the neutral nation of Belgium during a war.
C.
Germany instituted a policy of unrestricted submarine warfare.
D.
Germany began launching attacks on British civilian targets.

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.