Hello Danyella,
Your post stated that you were attempting to get into Recovery Mode however the key combination that you used OPTION + POWER is to Start up to ➔ Startup Manager, which allows you to choose other available startup disks or volumes. It is not a Recovery mode key combination.
Here is a link to some very good information regard Power Up key combination for your reference ➔ Mac Startup Key Combinations.
From the link above you will see that the Recovery mode Key Combination(s) is different. The recovery mode's various key combinations are listed here ➔ MacOS Recovery Modes. As you will see that Disk Utility can be used to erase the disk before a fresh installation of the MacOS. The Three Options are-
- Command-R
- Option-Command-R
- Shift-Option-Command-R
The functions of the above combinations are explained in the link above.
Axel F.