If the object is made of liquid, then you measure its mass and volume, because mass divided by volume is density.
If the object is solid with a regular shape, then measure its length, width and height, because length times width times height is the volume of a solid regular object.
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Assuming that this is referring to the same list of options that was posted before with this question, the correct response would be that they combined the agricultural output of the South with the mercantilist mindset of the North, although it should be noted that the South was more agricultural.
This was however obtained by a user named HistoryGuy, this question was also already answered.
The Peloponnesian War started between a conflict against the Athens and Greeks.
The canal was built in order to easily ship grain from the rich farmland in southern China to the capital city in Beijing