Which of the Following Is an Example of Survey Research

Multiple Choice

Which of the following is an example of survey research?

A) A researcher interviews taxpayers to find out how strongly they would support a proposal for a "flat" tax.
B) A researcher randomly divides her participants into two groups, giving one group a powerful new medicine while the other group gets a placebo.
C) A historian conducts an extensive study of the factors that led to the American defeat at Pearl Harbor in 1941.
D) A researcher tracks smokers and nonsmokers to see how many of them get lung cancer and if there are significant differences in lung cancer rates between the two groups.