The correct answer is C. Transaction.
An economic event is a happening that has a financial impact on a business. It can be anything from buying inventory to selling products to paying employees. Transactions are recorded in the accounting records to track the financial performance of the business.
Cash is a medium of exchange that is used to purchase goods and services. It is also used to settle debts. Bank statements are documents that show the transactions that have occurred in a bank account. Exchange of money is the process of transferring money from one person or entity to another.
While all of these things are related to accounting, only transactions are considered economic events. This is because transactions are the only things that have a direct impact on the financial performance of a business.