No start up disc on macbook air 2017
Hi, I am having trouble getting into my MacBook air. When getting ready to sell it I deleted the startup discs thinking it would just delete my data so that the buyer wouldn't see my personal info. It did this but also deleted itself. I am unsure of where to go from here and how to fix it. (I have inserted two pics; one of my disk utility option and what discs I have and also the 'reinstall macOS' screen which has no disc for me to choose).