To answer this question, you need to understand how SQL Server 2005 and earlier versions handle the date data type.
In SQL Server 2005 and earlier versions, the date data type is not available. Instead, you can use the datetime data type to store both date and time values.
In the given code, the variable @d is declared as a date type. However, the value assigned to it is a string '09/09/2008'.
Since the date data type is not available in SQL Server 2005 and earlier versions, trying to assign a string value to a date variable will result in an error.
Therefore, the correct answer is C) Error Message.