I need to upgrade my operating system, Mac OS 10.7.5, and want to know which one to use.

How can I upgrade my macbook pro Mac OS X 10.7.5?

So that is what is listed as the OS X version your Mac is now running?
If so then you have Lion. Again why do you think you need to upgrade? What did the store tell you that makes you think you need to upgrade? Are you having some type of incompatibility with some other Apple device?
You can upgrade to Mt Lion for $20 or Mavericks for free if your Mac meant the system requirements for those other versions of OS X.
But the real question is still why do you need to do this upgrade. There has to be an underlying reason for it.
pschmidt712 wrote:
Mac OS X  version 10.7.5

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