Dependent Variable question

Sarah Ann designed, conducted, analyzed, wrote, and published an experiment. In the 2 x 4 ANOVA, the F value for Art Medium was F A =8.8 indicating a significant difference in the Time it took to produce works of art using different media. The F value for Size of the art work was F B 1.2 indicating a nonsignificant finding. The interaction also was nonsignificant. What was the dependent variable?
A. Art Medium
B. Time
C. Size
D. Quality