Basically, what do you consider to be your "main" business? Maybe you do several things, but there's that one that takes most of your time, or makes most of your money, or that you put the most research into. Or maybe you really don't have a "main" business, because you do too many things or switch often. Whatever feels right to you.
Fitting in the categories may require a tough call but hopefully something feels more "main" to you. For example:
- If I made silver and just sold it, I would call that "Industrial Goods for Production." But if I used that silver to make necklaces, I would say my business is "Jewelery."
Likewise if you sell corn, that's "Farm Goods for Production." If you grow corn, use it to make eggs, and sell the eggs, that's "Food." If you use the corn for cattle and sell that, that's "Farm good for Production" again. But if you make corn, use it for cattle, use the cattle for leather, and use the leather for gloves, that's "Clothing & Textiles."
(And yes some of the categories are combined a bit strangely - polls can only have so many options.)
If I can't decide I will just stick to Steal, Stone and Wood. 