Received natural resource royalties from 3 different companies. None of which I own or work for. Why on only one is turbo tax wanting me to do a schedule C

[ColeenD3]

Please see this answer from KarenJ.

Royalties are reported either on Schedule C or Schedule E.  

In most cases, you report royalties in Part I of Schedule E (Form 1040). However, if you hold an operating oil, gas, or mineral interest or are in business as a self-employed writer, inventor, artist, etc., report your income and expenses on Schedule C or Schedule C-EZ (Form 1040).