Chemistry URGENT

I need help understanding oxidation I have a problem that states:
The proper assignment of oxidation numbers to the elements in the compound LiAsO3 would be:

I think the answer is +1 for Li, +3 for As and -2 for O.

I think I am confusing oxidation with ionic charge.

PLEASE HELP

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  1. Li is right as is O. As is not right. As is +5
    Here is a good site that explains how to do oxidation numbers.
    http://www.chemteam.info/Redox/Redox-Rules.html

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