Which of the following is an example of a quantifiable KPI for an email marketing campaign?

The number of new leads generated is a quantifiable KPI because it provides a specific, measurable metric directly tied to the campaign's success in attracting potential customers. This allows for clear tracking and evaluation of the campaign's effectiveness. The overall reputation of the business, how the audience feels, and the subjective takeaway are all qualitative measures. While important for understanding brand perception and audience engagement, they are not easily quantifiable and therefore do not serve as KPIs in the same objective, data-driven way as lead generation. KPIs must be measurable to effectively assess performance and inform future strategy.