The correct answer is C. Ecology.
Ecology is the scientific study of the relationships between organisms and their environment. It is a broad field that encompasses the study of the interactions between organisms and their physical environment, as well as the interactions between organisms and other organisms.
Physiology is the study of the function of living organisms. It is a branch of biology that deals with the physical and chemical processes that occur in living things.
Genetics is the study of genes and heredity. It is a branch of biology that deals with the transmission of genetic information from parents to offspring.
Geology is the study of the Earth’s physical history. It is a branch of Earth science that deals with the physical and chemical constitution of the Earth, its history, and its dynamic processes.
Ecology is the most relevant branch of biology to the study of the relationship between living things and their environment. It is the study of the interactions between organisms and their physical environment, as well as the interactions between organisms and other organisms.