Answer :
Final answer:
The Inca advancement that would be most useful for the farmer living on the edge of a steep mountain is a terrace.
Explanation:
The Inca advancement that would have the most use for the farmer living on the edge of a steep mountain is a terrace. A terrace is a type of agricultural technique where steep slopes are transformed into a series of flat platforms. This allows the farmer to create more arable land for cultivation, preventing soil erosion and increasing crop production.
Learn more about Inca advancements for agriculture here:
https://brainly.com/question/15314623
