The correct answer is A. sparingly.
To use something sparingly is to use it in a careful and economical way. This means using only as much as is needed and not wasting any. In the context of the question, the country’s resources should be used in a way that does not deplete them or cause them to be used up too quickly.
The other options are not as accurate. Option B. reasonably means using something in a way that is fair and just. This does not necessarily mean using it sparingly. Option C. adequately means using something in a way that is sufficient or enough. This does not necessarily mean using it sparingly either. Option D. immensely means using something in
a very large or great amount. This is the opposite of what is meant by the question.In conclusion, the correct answer is A. sparingly. This means using the country’s resources in a careful and economical way.