单项选择题

A.From Windows Vista, extend Disk 0 Partition 1. Install Windows 7 in Disk 0 Partition 1.
B.From Windows Vista, create a new partition. Install Windows 7 in Disk 0 Partition 1.
C.Start the computer from the Windows 7 installation media. Install Windows 7 in Disk 0 Partition 1.
D.Start the computer from the Windows 7 installation media. Install Windows 7 in the unallocated space on Disk 0