When relating to a coworker who appears to be emotionally unstable, it is best for you to a. explain carefully that you will not be manipulated by him or herb. express sarcasm about his or her problemsc. be laid back and reassuringd. frequently tell him or her to “lighten up” or “chill out.”

I would say A. because an emotionally person would not want to be told to chill out

But if "frequently telling him or her to 'lighten up' or 'chill out'" is answer C

and be laid back and reassuring is answer B.

Most definitely B. But if those are combined into one answer than A is correct

are there any options?