How did the Inca use local resources to build their empire?

The Incas used locally available material to sustain the empire.

Explanation:

The Inca people were dependent locally available food sources in the form of edible roots, potatoes, maize, guinea pigs, llamas, dried fish, etc. They have sought methods to transform the barren land into more fertile and ideal for cultivation in South America. Where required, llama and alpaca fertilizer were used as an alternative fuel. The Inca Empire had huge amounts of bronze, gold, and silver and much of it was used for ritual purposes. They used stone and wood for construction purposes.

c is the answer for this

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.