Research is a careful and detailed study into a specific problem, concern, or issue using the scientific method. Which in the following BEST supports the definition of research?

A. research is the systematic way of learning about the physical world.
B. research is the use of your cognitive faculty and applying your senses to come up with an important problem.
C. research is the systemic investigation and study of materials and sources in order to establish facts and new conclusion.
D. research can only be done by scientists and science enthusiasts.​