The right option is; Claude Bernard
Claude Bernard recognized the vital role of the internal environment and suggested that the objective of mechanisms within the body is to preserve the constant conditions of the internal environment.
Claude Bernard was a French physiologist who created a concept concerning the internal environment of organisms which provided better understanding of homeostasis (regulation of important processes). Claude Bernard stated that the stability of the internal environment is responsible for the free and unconventional life of organisms. He also explained that the living body does not relatively rely on its external environment, even though it needs it.