In an experiment on religious attitudes, high school seniors who expressed no religious preference were asked to tell a story about a picture of a religious leader. The pictures were of a Jewish rabbi, a Catholic priest, and a Protestant minister. Each student told two stories about each picture. The order in which the pictures were presented was random for each participant. The stories were then scored for the number of negative adjectives used (words like bad, prejudiced, stingy, dumb, afraid, etc.). Identify the a . dependent variable b . independent variable and the names of the levels C . a controlled extraneous variable a categorical variable