This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to make a liquid into a solid
Place a small open container of water in the freezer compartment of a class or home refrigerator.
Leave the water there for several hours or overnight.
Remove from the freezer and note what has occurred.

OPTIONS:
(a). Water changes state from liquid to solid when it reaches a temperature of 0 degrees celsius, or 32 degrees fahrenheit. This is a simple example of changing from liquid to solid, or freezing.;
(b). Check that the container is completely dry, but no ice has formed. You should get a sample before disposing of it.;
(c). Don't drink and continue making liquid. Separate the ice water if you're not used to using water.;
(d). Set a timer to check on the reaction. The liquid should be safe to use again once the water has frozen completely and the food appears firm.;
The answer is:
(a).