The nurse caring for a client hospitalized for an anxiety disorder writes in the medical record, "Emotionally labile today at lunch time; behavior plan implemented." What does the word "labile" mean in this nurse's note?

"Boorish" means rude, uncouth, or ill-mannered. It describes someone whose behavior is unpleasant or socially unacceptable, especially in social settings like a dinner party.

"Contract" means to become smaller or tighter, making option C the correct answer.

Osmosis is the process by which water moves across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration, making option A the correct answer.

An "ominous" sign indicates something threatening or foreboding. In this context, it suggests that the sign observed on the monitor is indicating a potentially serious or dangerous condition that requires attention.