The correct option is (A) prepare a trial balance.
Any transaction between the business and an external entity is referred to as an external transaction. Each transaction entails a resource transfer.
Step 1: To determine which accounts were impacted by an external transaction, use the source documents.
Step 2: Examine the transaction's effects on the accounting formula.
Step 3: Determine whether the transaction affects account balances in a debit or credit fashion.
Step 4: Enter the transaction using debits and credits in a journal.
Step 5: The transaction must be posted to the general ledger.
Step 6: Create a trial balance.
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The complete question is: "Which step in the process of measuring external transactions involves determining the effect on assets, liabilities, and stockholders’ equity?
(A) Prepare a trial balance.
(B) Use source documents to determine accounts affected by the transaction.
(C) Post the transaction to the T-account in the general ledger.
(D) Analyze the impact of the transaction on the accounting equation."