Which of the Following Is Not True of Experimental Research

Multiple Choice

Which of the following is not true of experimental research?

A) Powerful emotions such as grief, fear, and love do not easily lend themselves to experimental manipulation.
B) It is not affected by experimenter bias.
C) People in the laboratory may behave differently than they would in real life.
D) It can be used to prove a cause-and-effect relationship between variables.