Which Statement Best Describes an Ideal Relationship Between Theory and Practice

Which statement best describes an ideal relationship between theory and practice?

A) Two areas that should remain separate to promote innovation while reducing bias
B) They are in competition with one another to promote innovation and change
C) They are distinct, but equally important, areas that share the purpose of informing research
D) A dynamic interaction in which they enrich and inform one another and inform research
E) It is cyclical, but recognized as no longer relevant to health behavior change