Geologists strongly believe that Mount Vesuvius, due to its active volcanic nature, will inevitably undergo another major eruption. Determining the intensity and potential impact of this future eruption, however, proves challenging due to insufficient understanding of the internal dynamics of the volcano. Recently, geophysicist Elena Romano and her team trialed a method involving the study of past lava flow patterns to predict the volcano's potential destructive pathway, but they concluded that this method could not sufficiently characterize the internal pressures of Vesuvius to accurately predict the destructive potential of its future eruptions.
Which choice best describes the function of the second sentence in the overall structure of the text?
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