Participants in an Experimental Research Study Listen to a Lecture

Multiple Choice

Participants in an experimental research study listen to a lecture either in a lecture hall filled with natural light or in a lecture hall with no windows and artificial light.Before leaving the lecture halls,the participants fill out a mood survey.What is the independent variable in this study?

A) the participants' responses to the survey questions
B) the number of participants in the experiment
C) the type of light in the rooms
D) the mood survey