If Jack & Jill's business goal is to increase sales, which advertising metrics will help them measure performance?

The correct answer is "Sales." When the business goal is to increase sales, the most direct and relevant metric to measure performance is sales itself. This metric tracks the actual revenue generated from the ads, providing a clear indication of how well the advertising efforts are translating into purchases. By focusing on sales, Jack & Jill can directly assess the effectiveness of their campaigns in driving conversions. While click-through rate (CTR) and clicks are important for measuring engagement and ad effectiveness in capturing attention, they do not provide the ultimate measure of success in terms of business goals like sales. Therefore, tracking sales is the most aligned metric to gauge performance and determine if the campaigns are achieving their sales targets.