In the Lacey et al. (2011) Roadside Survey study, the researchers demarcated their research sites by placing two signs--“NATIONAL ROADSIDE SURVEY” and “VOLUNTARY SURVEY”--in close proximity to where participants were recruited (329). Which of the Belmont Report principles does the placement of these signs best represent?
a. achieving valid results
b. beneficence
c. justice
d. respect for persons
e. informed consent
