Final answer:
The correct action for Bertran Industries' incorrect entry is to make an adjusting entry to debit Accounts Payable and credit Cash for the $45 difference.
Step-by-step explanation:
When the accountant for Bertran Industries discovered that a $649 check payment was incorrectly entered in the journal as $694, the correct action to take is B: An adjusting entry must be made to debit Accounts Payable and credit Cash for $45. This is because the original entry overstates the cash disbursement and the liability. The journal needs to reflect the actual amount paid of $649, so a $45 difference needs to be reconciled with an adjusting entry.