Which of the following would be considered a quantitative evaluation method?

The correct answer is the analysis of sales figures, as it represents a quantitative evaluation method. Quantitative evaluation focuses on numerical data and objective measurements that can be statistically analyzed. Sales figures provide concrete data about the performance of a product in the market, allowing for clear insights into its success and areas for improvement based on actual numbers.

In contrast, user feedback surveys, while they can include numerical ratings, are often qualitative as they reflect personal opinions and experiences. Trialing various prototypes typically involves qualitative assessments based on user interactions and preferences rather than numerical analysis. Visual checks may be used to evaluate products based on appearance or functionality, but they also lack the objective, statistical nature that defines quantitative methods. Thus, sales figures analysis stands out as the approach rooted firmly in quantitative evaluation.