Which of the following cannot be determined from the sales data of a bakery?

The ability to analyze sales data offers insights into various aspects of a bakery's operations. While options A, C, and D all involve quantifiable metrics that can be derived directly from sales data, option B pertains to individual customer behavior.

To determine which customer purchases bread most frequently, the sales data would need to include specific customer identifiers or tracking information. In most cases, standard sales data does not record personal customer details unless a loyalty program or similar mechanism is in place. Therefore, while the sales data can reflect total sales, patterns in item popularity, and peak sales days, it does not include information on customer identities or their individual purchasing frequency. This limitation makes option B the correct answer.