Alfred Marshal was one of the most influential economists of his time and the author of the Principles of Economics book which was the principal economic textbook in England for long years. During his economic theory development, he borrowed a concept from the marginalists which is the theory of demand and the collective result of buyers who yearns services and products or the concept of scarcity.
The correct answer would be D, gravity. As moving water will cause rocks to erode as well as wind, and animal habitation.
Answer:
B is the answer I guess for the question
