The trial balance at the end of the month shows the total debit balance is $1500 greater than the total credit balance. When recording the transaction for payment of wages of $1500 the following error would most likely have occurred:

a. an incorrect entry where both wages expense and cash were debited for $1500.

b. a transposition error where both the debit to wages expense and the credit to cash were recorded as $5100.

c. an incorrect entry where both wages expense and cash were credited for $1500.

d. a single-entry error where wages expense was debited for $1500 but the credit to cash for $1500 was not recorded..