An organization hired a highly qualified accounts payable manager who had been terminated from another organization for alleged wrongdoing. Six months later, the manager diverted US $12,000 by sending duplicate payments of invoices to a relative. A control that might have prevented this situation is to
adequately check prior employment background for all new employees

The correct answer is what you have provided,that is adequately checking prior employment background for all new employees

Explanation:

Ensuring that background checks are conducted on all newly recruited employees would have been the saving grace.

Besides, asking questions concerning the reason an employee left previous employers sometimes gives direction on which employers should be written to.

Also,some employers even wait for the results of background checks before new recruits are finally given letters of appointment,in other words, these efforts are geared towards ensuring new employees are people of integrity,trust and honesty.