Unable to recover Mac OS

I am currently trying to recover the OS on an old Macbook. When I book up the mac I get the flashing folder with a question mark.
I have booted in internet recovery mode but it only gives me the option to recover Mac OS X Lion 10.7 but I have purchased Mountain Lion 10.8.
what can i do?

flashing folder...
Try booting while holding down the Option key only.
A flashing question mark or globe appears when you start your Mac

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