The correct answers are:
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While Amir is working as an employee C Co, he cannot audit C Co on behalf of A Co because he faces a self-interest threat True
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While Amir is working as an employee C Co, he cannot audit C Co on behalf of A Co because he faces a self-review threat False
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While Amir is working as an employee C Co, he cannot audit C Co on behalf of A Co because he faces a familiarity threat False
An external auditor cannot be an employee of the organisation they are auditing because the auditor must be (and be seen to be) independent. This is a self-interest threat.