What Might a Nursing Research Study Address

What might a nursing research study address?

A) Whether having a nurse practitioner manage care is effective in decreasing length-of-stay
B) Whether nursing students learn better in an online course format, or by actual lecture attendance
C) Comparison of four types of leadership used by nurse managers, and comparison of their employees' job satisfaction, absenteeism rates, and error rates
D) Three different commonly performed surgical procedures and the mortality rate of each
E) Learning specific things about the liver failure patient that can be applied to nursing practice