Windows XP mode on a Windows 7 Professional machine fails to load. Which of the following isMOST likely the cause?（）

• A、The machine does not have enough processor cores to allow for this feature.
• B、Virtualization support is not enabled in the BIOS.
• C、A license of Windows XP must be purchased in order to use Windows XP Mode.
• D、The machine does not have enough RAM to allow for this feature.