Answer:
I would guess the physical land feature that matches both of these in the list of "Pre-Columbian Inca Empire" would be valleys. If it is asking for more you can add rich soil quality and good climate to the physical quality of the setting.
Explanation:
The definition of a feature is a quality or a special attraction. If farmers developed terraced agriculture to produce the food they need a certain physical land feature to make this happen. And if builders constructed roads to connect the territories of the empire they needed a specific land feature as well. So my guess out of all the physical land features the one that fits best here is valleys. The soil in valleys is good for farming. Not as many people live in the mountains. Mountains can be rugged and steep. Food is harder to grow in the mountains. Plains would be too dry and empires cannot be built on just flat plains.
