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When asking for a structure they are usually looking for the one that is most stable. If the compound is neutral you will draw the one with an overall charge of zero. You can identify the charge by using formal charge.
I think that if there is a single compound with multiple resonance structures that are equally stable (example, the different resonance structures of benzene, C6H6), you should draw all possible Lewis structures with the arrow notation in between. If there is a single most stable Lewis structure, however, that one should be the single correct answer.
If it is a structure where you can change where the double bonds go while keeping the charges the same except for the molecules that you shifted the bond between, then draw the resonance structures and the double arrows between them because the most stable structure is a mixture of the resonance structures
The resonance structures should be equally stable. However, the Lewis structure for this specific compound does not represent its real appearance because a compound that has resonance structures actually have the resonance bond constantly changing from atom to atom, so that is why we said we can have multiple structures because the bond does not belong to one of the atoms permanently.
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