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The correct answer is My boss, who was recently promoted again, is great at motivating her employees. That is because it has an appositive phrase that is separated by commas properly. Dashes wouldn't be used here because they are used in different situations, not to separate apposition.
My boss, who just received another promotion, is excellent at motivating her staff.
My employer, who just received another promotion, is excellent at inspiring her staff.
Thus option A is right.
How do I address my supervisor in a formal manner?
In summary, you can refer to the manager as a "team leader," "coordinator," or even just "bro," but "manager," "supervisor," or "boss" are accurate, generally known English terms for his or her role.
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