The answer is D because you want to have a control group! Hope it helps!
Answer: Cheerfulness, positive attitude
Explanation:
Customer service is part of the backbone of business. How customers are treated would determine how long the business would last, when customers are not treated well, there won't be a growth regarding the business, employees would need this in mind considering the various kinds of clients they would come across and it's very obvious they won't be the same, a lot of positive mindedness and cheerfulness is required, this is what is required a lot for Susan's job
It’s either C or D. I’m leaning more towards C though.
