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B
Gold coin
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C
Steel spoon
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D
Iron keys
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Solution
The correct option is A Plastic ball Depending on how heavy the objects are, and how much space they occupy, some objects float on water, while others sink.
From the given options, a plastic ball, being lighter than the same volume of water, floats on water. Whereas a gold coin, a steel spoon, and an iron key, being heavier than the same volume of water, sink in it.