Answer: Answer - A: Smiling
Explanation: Smiling will have the most positive effect out of all of them. Smiling is proven to have a positive effect on others. It makes others feel that you are friendly, positive, and/or honest/trustworthy.
Please rate my answer so that I know if it's correct or not, because sometimes answers are correct on my Edg 2020 for my state, but incorrect on others.