Final answer:
The word 'exploit' means 'use' in this context.
Step-by-step explanation:
The most precise meaning of the word exploit in the given context is use. In this sentence, it means that the people do not know how to effectively use or take advantage of the resources available to them on their land.
For example, they might not know how to use the natural resources in a sustainable or profitable way.
Therefore, option d. use is the correct answer.
Learn more about Word meaning and Context