A Chunk of Ice (T = -20°C) Is Added to a Thermally

A chunk of ice (T = -20°C) is added to a thermally insulated container of cold water (T = 0°C) . What happens in the container?

A) The ice melts until thermal equilibrium is established.
B) The water cools down until thermal equilibrium is established.
C) Some of the water freezes and the chunk of ice gets larger.
D) none of the above