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Question 120·Hard·Central Ideas and Details

While studying a grain shortage in an eighteenth-century port, historian Mara Ellison noticed an apparent contradiction. Harbor ledgers showed that imported tonnage had changed little, whereas bakers petitioned officials about severe scarcity. Ellison found that the ledgers counted grain when it was unloaded, including moisture-damaged cargo and shipments already promised to inland buyers. Merchant letters documented warehousing delays, and municipal inspection books recorded a decline in the weight of standard loaves. When Ellison arranged the records by week, lower loaf weights aligned with increased damage in some weeks, larger inland commitments or longer delays in others, and combinations of these conditions in still others. The ledger entries were internally consistent; meanwhile, the petitions’ claims, although intended to persuade officials, tracked the loaf-weight changes. Ellison did not convert all the records into a single supply series. She preserved the ledger categories, marked each cargo’s condition and destination, and read each petition alongside the same week’s inspection entry and merchant correspondence.

Which choice best states the main idea of the text?