You should set up return on investment (ROI). You should set up return on ad spend (ROAS). You should set up impression share. You should set up total number of clicks. The correct answer is: You should set up impression share.
Your answer is conversions. Your answer is engagements. Your answer is return on ad spend (ROAS). Your answer is return on investment (ROI). The correct answer is: Your answer is conversions.