A chunk of ice at T=-20degree celcius is added to a thermally insulated container of cold water at T=0 degree celcius. What happens to container?

a) thermal equilibrium cannot be reached

b) water will get colder until thermal equilibrium is reached

c) nothing happens because the system is already in thermal equilibrium

d) some of the ice will melt until thermal equilibrium is reached

e) some of the water will freeze until thermal equilibrium is reached

please explain you answer and reason you choose that answer( at least 1 paragraph)

The mixture of the chunk of ice and water is thermally insulated which means heat energy is not absorbed by the system nor does the system release energy to environment. Water loses heat energy to the chunk of ice and its temperature drop leading to some of the water to freeze and increase the size of the chunk hence some of the water will freeze until thermal equilibrium is reached.