C. Student # 2 predicts that the vacuole will appear smaller and the chloroplasts and nucleus will have moved due to the cell membrane shrinking as water exits through osmosis.
Explanation:
Adding the drop of water to the slide puts the cell in a hypertonic solution and the water inside the cell will rush out of the cell to where there is less water, causing the cell to shrivel.
You are right, it is B because, endocrine glands, as part of the endocrine system, they regulate and maintain a constant equilibrium in our bodies, known as homeostasis.