Why Is Optimization of Biological Processes Not Realized

Why is optimization of biological processes not realized?

A) because of phylogenetic constraints, and the fact that most biochemical, morphological, and physiological systems have multiple functions
B) because of phylogenetic constraints, and the fact that most biochemical and morphological systems have multiple functions
C) because of phylogenetic constraints, and the fact that most biochemical and physiological systems have multiple functions
D) because of phylogenetic constraints, and the fact that most morphological and physiological systems have multiple functions