Most of the following treatments would drastically slow or stop water movement through a plant. However, one of these would not have this effect. Which of the following treatments would allow water to move freely through the plant?
A. Submerging a plant's roots in a bucket of salt water.
B. Removing all the leaves from a plant.
C. Treating the plant with a drug that makes stomata open.
D. Injecting air into the xylem.