Final answer:
Evidence-based nursing (EBN) was not the first initiative by nursing to apply research but has evolved alongside evidence-based medicine, which was started by physicians. The United States is a significant contributor to EBN, but it's not necessarily the definite world leader in the field.
Step-by-step explanation:
The correct statement about evidence-based nursing (EBN) is that it is not the first initiative by Nursing to apply research findings to clinical practice, nor is it the most recent development. EBN has a long history dating back to Florence Nightingale's use of evidence in practices like sanitation. However, the formalization of EBN as a systematic approach began to develop more robustly alongside evidence-based medicine (EBM), which was indeed started by physicians. While the United States contributes significantly to the field of EBN, declaring it the world leader could be subjective and is not an absolute statement. Therefore, option B seems to be the most accurate: EBN was started by physicians involved in Evidence-based Medicine.