decreases it your answer
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water pipes burst because the water inside them expands is it gets close to freezing, and this causes an increase in pressure inside the pipe. when the pressure gets too high for the pipe to contain, it ruptures.
(d) liquid is being formed.
the enthalpy of fusion of a substance (–hfus) is the change in its enthalpy when the substance changes its state from a solid to a liquid. it happens when heat is supplied to some quantity of substance which is originally in solid state & it turns into liquid.
example- melting of ice.
to melt ice energy is required. approximately, 333 kj of energy is needed to heat 1 kg ice to convert into liquid.