Which of the Following Are Not Likely to Be True

Multiple Choice

Which of the following are not likely to be true of a study using opportunistic sampling?

A) Some of the cases might be similar to those used in critical-case, negative-case, and extreme-case sampling
B) The cases that are studied might alter the focus of the study
C) The researcher has a firm research plan that is clearly stated before the research starts
D) The researcher is able to take advantage of opportunities that present themselves during the research process