You Perform an Experiment in Which You Take 16 Pots

You perform an experiment in which you take 16 pots of strawberry plants and give half of them 1 gram of ammonium nitrate per liter of water and the other half receive only water. Each group is then split in half again, and exposed to either 8 or 16 hours of light each day. You monitor the height of the plants for 4 weeks. You observe that plants grown in ammonium nitrate and 16 hours of light grow taller than no ammonium nitrate and 8 hours of light.
-Which of the following is/are independent variable(s) in this experiment?

A) amount of ammonium nitrate and light
B) amount of water
C) amount of carbon dioxide
D) height of the plants and amount of light
E) height of the plants