In the United States During the 1970s, Nursing Practice Included

In the United States during the 1970s, nursing practice included the use of granulated sugar to pack stage III and IV wounds based on the idea that bacteria would be less invasive of new tissue formation. Over time, this method did not result in statistically significant increases in wound-healing time when compared to the saline wet-packing method. Research was initiated to determine which packing method led to the best wound healing. The use of sugar for wound packing was an example of what type of practice?

A) Nursing practice based on personal experience
B) Nursing practice based on research
C) Nursing practice based on untested theory
D) Nursing practice based on tested theory