Which of These Systems Is Least Likely to Be at Chemical

Multiple Choice

Which of these systems is least likely to be at chemical equilibrium?

A) a test tube of living cells
B) a test tube of organic molecules, kept in the freezer
C) a test tube of dry organic molecules, kept at room temperature
D) a test tube of organic molecules dissolved in water, kept at room temperature
E) a test tube of dead cells in water, kept at room temperature