Which characteristic of a solid is most responsible for there structure

Solids: have fixed shape and fixed volume

Liquids: have fixed volume

Gases: have neither fixed volume or fixed shape

This tells you that having a fixed shape is the most responsible characteristic of a solid's structure.

There are multiple answers to this question depending on what answer it's looking for. This is one of the right answers but I don't know if it's the one the question is looking for.