Trouble doing a factory reset of 2012 Macbook Pro

Hey everyone, thanks for any help that can be provided here.

I am attempting to factory reset MY mid 2012 Macbook Pro. I have gone through the process that shows the "OS X Utilities: page with Restore from time machine backup, Reinstall OS X, Get Help Online, and Disk Utility"

When I select "Reinstall OS X" I then agree to the terms. Then it asks me to select the disk where I want to install the OS X. It will not let me select the Macintosh HD drive and says I can not install Mountain Lion because a newer OS X is installed.

Any advice on where to go from here? Thank you!

Submitted September 30, 2017 at 07:49AM by BurntToast13 http://ift.tt/2kalHRi