No – Windows does not boot from anything else than C: – you can read “C-Drive” as “Windows-Boot-Drive”. You can make another drive the C: drive, but probably not with your setup, as others explained.
Is boot drive the C: drive?
Windows and most other OSs always reserve letter C: for drive/ partition they boot of. Example: 2 disks in a computer.
Why is the boot drive always C?
The reason is because it is the first available drive letter for hard drives. The computer reserves A: and B: drive letters for the floppy disk drive and removable media, such as tape drives, even if these devices are not installed in the computer.