A Researcher Has Been Putting Up Posters to Recruit Participants

Multiple Choice

A researcher has been putting up posters to recruit participants for a study on auto racing (e.g., NASCAR) , but only two or three people have responded. What might the researcher do to find participants?

A) Change the study's inclusion/exclusion criteria to increase potential participants
B) Change the study's topic to be more attractive to potential participants
C) Change the recruiting method to snowball sampling with those who have responded
D) Change all of the above aspects of the study's design