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I think your answer would be B: Journal.

Adjusting entries are journal entries recorded at the end of an accounting period to alter the ending balances in various general ledger accounts. These adjustments are made to more closely align the reported results and financial position of a business with the requirements of an accounting framework, such as GAAP or IFRS. This generally involves the matching of revenues to expenses under the matching principle, and so impacts reported revenue and expense levels.

answer; rapid growth in buyer demand and high buyer switching cost;