The Four Levels of Research, a Main Focus of This

The four levels of research, a main focus of this chapter, are related across a hierarchy where the lower levels support and inform the higher levels. Therefore, many professions may have their practice and research focus at a certain level but need to borrow from other levels to train and inform their practitioners. Which of the following best exemplifies this practice?

A) Biology, a level 1 (descriptive) discipline, relies heavily on the medical profession (level 4 prescriptive) to identify needed areas of basic research.
B) Chemistry, a level 4 (prescriptive) discipline, depends heavily on the pharmacy profession at level 1 (descriptive) to inform their basic research.
C) Occupational therapy, at level 3 (predictive) , borrows knowledge from physical therapy, a level 4 (prescriptive) profession, in its intervention research.
D) Physical therapy relies heavily from level 1 (descriptive) disciplines such as anatomy and kinesiology to inform their intervention research at level 4.