The correct answer is D. People
Step-by-step explanation:
Geography is a science that focuses on studying the surface of Earth as well as other phenomena related to our planet and even other planets. In this context, many geographers consider people or human societies are the most important agent of change on Earth. This is because since the emergence of human communities different features such as water bodies, soil, landscapes, and even climate have changed as a result of human activities. For example, all around the world natural landscapes were replaced by cities or human settlements, which completely transformed these places and other geographical features in these such as temperature, spatial relationships, among others.