Hello! I am a little confused on this homework question I have. Thank you so much for your help!

Question 12 [1 point} A researcher thinks that listening to classical music reduces anxiety. She measures the anxiety of 10 persons then plays Mozart's "Eine Kleine Nachtmusik" {listen here if you want--you know the tunel]I for them. Following that the researcher measures their anxiety again. {Note that anxiety is measured on a scale from 1 to if, with higher numbers indicating increased anxiety.) In this design, classical music is the 0 independent yariable. O criterion variable. 0 dependent variable. 0 outcome variable