A Group of Students Was Asked to Write an Essay

Multiple Choice

A group of students was asked to write an essay in support of the legalization of marijuana. They were paid $.50 each. Another group of students received $2.00 each for performing the same task. It was subsequently found that those students who received only $.50 each developed a more positive attitude toward the legalization of marijuana. The researcher in this study was using the ________ method of research.

A) correlational
B) survey
C) naturalistic observation
D) experimental