Final answer:
The subject of this question is a controlled experiment. In a controlled experiment, researchers study consumer responses to advertising and other forms of communication in controlled settings where environmental variables can be kept constant.
Step-by-step explanation:
The subject of this question is a controlled experiment. In a controlled experiment, researchers study consumer responses to advertising and other forms of communication in controlled settings where environmental variables can be kept constant. In this type of scientific investigation, the researcher manipulates an independent variable to see how it affects another variable, known as the dependent variable. For example, researchers may manipulate the content or timing of an advertisement and measure how it influences consumer behavior or attitudes.