Which of the following system is equilibrium?

A. An open pan of water is boiling on stove while temperature of water is constant.
B. Water is freezing in an open ice box. Temperature of water is constant.
C. An anti-bill follows its daily b/c. The population of anti-bill is constant
D. Balloon contains air and few drops of water, the pressure in ballon is constant.

C. An anti-bill follows its daily b/c. The population of anti-bill is constant

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