The manager of a bakery argues that switching from plastic to paper packaging will improve the bakery's reputation among its customers. Which of the following, if true, most strengthens the manager's argument?

The claim is about the opinion of this bakery's customers, and evidence drawn from those very customers linking avoidance of plastic to a better opinion supports it directly. Cost is irrelevant to reputation, the bakery's age is beside the point, and what a bakery elsewhere did says nothing about how these customers will react.