Answer :
Final answer:
Water is most dense at 4 degrees Celsius because the water molecules are arranged in a hexagonal crystal lattice structure.
Explanation:
The correct answer is A. 4 degrees Celsius. Water is most dense at this temperature because, as water cools down from higher temperatures, the water molecules start to move slower and come closer together. At 4 degrees Celsius, water molecules are arranged in a hexagonal crystal lattice structure, which allows for maximum packing and makes water the densest in its liquid form.
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