Final answer:
Windows XP Mode is a feature included in the higher editions of Windows 7, therefore B. Windows 7 Business Edition is the correct answer.
Step-by-step explanation:
The Windows XP Mode is a feature designed to provide better backward compatibility for running older applications. It is not available in Windows Vista Ultimate (A) or Windows XP Professional (C). Likewise, it is not offered in Windows Server 2008 R2 (D). Windows XP Mode was specifically made for Windows 7 and is available in higher editions such as the Windows 7 Professional, Windows 7 Enterprise, and Windows 7 Ultimate versions, which makes option B, Windows 7 Business Edition, the correct answer if we assume that by 'Business Edition' it refers to the professional versions of Windows 7.