Final answer:
The steep slopes in the eastern part of the Brazilian Highlands hinder the development of inland areas due to the challenges they present for agriculture, logging, and mining. The rugged terrain and dense rainforest make it difficult for human settlement and economic activities.
Step-by-step explanation:
The steep slopes in the eastern part of the Brazilian Highlands have hindered the development of inland areas. These slopes make it difficult for agriculture, logging, and mining activities to take place. The rugged terrain and the dense tropical rainforest on the slopes pose significant challenges for human settlement and economic development.