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(2) is out because ambiguous.  P may not exist and the space may be a vacuum

(3)  is out because ambiguous.  Again from the picture, it is not clear if P and R is solid or liquid.

(4) is not because ambiguous. It may look like a liquid but it could be a solid, gelatin substance?

(1) is the clearest because it is upside down, yet the substance remains firm without flowing down.  It could be a gelatin type of solid so it could stay up there.  So it has its own volume fixed and does not move according to the container.

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Thanks sushi88. God bless you. 🙏

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It’s a weird question.  I suppose Q can be a solid, and the bottle is air tight.  But even solids can be compressed (think of the mass in a black hole).

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