Tia ran an experiment to test the effect of light on plant growth. She placed 5 plants in a dark cabinet (no light), 5 plants outside the cabinet (low light), and 5 more plants on the window sill (high light). She gave all plants equal water and kept them at room temperature. She measured plant growth every other day for 2 weeks. What Independent variable did Tia test during her experiment? A - Room temperature
B - Levels of light
C - Plant grown
D - Amount of water