Which of the following statements is true regarding the complexity of biological systems?

A) An understanding of the interactions between different components within a living system is an approach towards understanding reductionism.
B) Knowing the function of a component of a living system can provide insights into the structure and organization of the living system.
C) Understanding the chemical structure of DNA reveals how it directs the functioning of a living cell.
D) An ecosystem displays complex properties of the biotic component only.