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The following sentence consists of an incomplete part that has been split into four jumbled parts labelled P, Q, R, S. Select the combination that correctly completes the sentence: The increasing use of 'dark fleets'—uninsured and aging tankers—to transport sanctioned crude oil has created a ticking environmental time bomb _______________________________________________ potentially leaving coastal nations to bear the astronomical costs of a catastrophic spill. P. by exploiting the jurisdictional gaps in international maritime law that allow vessels to operate under 'flags of convenience' Q. which lack the rigorous safety certifications and financial guarantees required by mainstream shipping registries R. through the frequent use of ship-to-ship transfers in international waters to obfuscate the true origin of the cargo S. effectively bypassing the global insurance 'P&I clubs' that provide the necessary indemnity for large-scale ecological disasters