Final answer:
The correct criteria to select records with a HireDate greater than 1/1/2008 is '> #1/1/2008#'.
Step-by-step explanation:
To select only those records where the HireDate field value is greater than 1/1/2008, the criteria that should be added to the ManagerData query is option a) > #1/1/2008#.
This criteria selects records where the HireDate field value is greater than the specified date. The greater than symbol (>) indicates that the HireDate should be later than 1/1/2008.
For example, if a record has a HireDate value of 1/15/2009, it would be selected with this criteria since it is greater than 1/1/2008.