Doesn't work
New keyboards do not have an 'option' key, it is the 'alt' key.
Pressing ALT during reboot it does not display the startup manager.
Pressing C during reboot it doesn't start from my usb bootable disk
iMac, OS X Mountain Lion (10.8.2)
The Option key is the same as the Alt key, so there's nothing to worry about it because it's normal.
When you press the C key while your Mac is starting, your Mac starts from a DVD, not from an external disk. Turn on your Mac and hold the Option key after the startup sound, so the Bluetooth keyboard can be detected by the Mac