C & D are correct. How many Senior auditors were there? If you were the only one use D (the), if more than one use C.
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AvangiA. I handled two functions simultaneously as senior auditor and acting supervisor.
B. I handled two functions simultaneously as a senior auditor and acting supervisor.
C. I handled two functions simultaneously as a senior auditor and an acting supervisor.
D. I handled two functions simultaneously as the senior auditor and acting supervisor.