The correct answer is A. Error of complete omission.
An error of complete omission is an error in which a transaction is completely omitted from the accounting records. This can happen for a variety of reasons, such as a mistake in recording the transaction, or a transaction being forgotten altogether.
An error of posting is an error in which a transaction is recorded in the wrong account. This can happen for a variety of reasons, such as a mistake in identifying the account, or a transaction being recorded in the wrong period.
A compensatory error is an error that offsets another error. For example, if a company mistakenly records a sale of $100 as $1000, the error will be offset if the company later mistakenly records a purchase of $900 as $9000.
None of the above options are errors that affect only one account.
