I stumbled upon this beautifully user-friendly, human-speaking quotation journey ceda-nepal.com/cost-calculator/ and I couldn't find any article about this kind of journey.

I am currently designing a similar "quotation" journey that will help the stakeholders sort their users into 5 categories, and then direct them to different registration processes. I would like to see more example of same UI, and if possible get to the technical, common name used for this type of "multiple options journey" but couldn't find anything with these keywords.

Do you know how this structure is widely known as?

Can you recommend any literature/best practices when using them?