Guard Cells Can Actively Increase Their Volume And, Therefore, Size

Multiple Choice

Guard cells can actively increase their volume and, therefore, size by:

A) increasing the amount of solutes, such as K⁺ and Cl^-.
B) reducing the amount of solutes, such as K⁺ and Cl^-.
C) increasing the amount of water in the cells without changing solute concentration.
D) decreasing the amount of water in the cells without changing solute concentration.
E) increasing the amount of CO₂ in the cells.