It depends a bit on context, but I'd say. . confusion over / confusion concerning.
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CliveIt depends a bit on context, but I'd say. . . . confusion over / confusion concerning. . . . .Thanks a lot for your help teacher.
CliveNo, don't say 'of' or 'on'.Say 'over'.Got it.
CliveNo.Clumsy and unclear.I thought that too. Thanks again teacher.