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The answer is "b. an open".

Volume refers to the amount of three-dimensional space which is encased or enclosed by a surface which is closed, for instance, the space that a substance or shape involves or contains. Volume is regularly evaluated numerically utilizing the SI determined unit, the cubic meter.
W0lf93
An open An item that is not entirely solid can be deemed to be a semi solid material and these items have a state that is somewhere in the middle between a solid and a fluid. A complete solid can hold it's their own weight and shape.

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