Which action meets the requirement to show washing instructions in a dedicated section of the detail page?

To show washing instructions in a dedicated section of the detail page, setting the custom attribute as localizable is the correct approach. This enables the attribute to be translated and displayed differently based on the user's locale. By marking the custom attribute as localizable, you ensure that the washing instructions can be customized and rendered in various languages or formats, enhancing the user experience for customers browsing in different regions.

Localizing the custom attribute means that when a user visits the detail page, they can see the appropriate washing instructions based on their locale settings. This is vital for providing accurate and relevant information to shoppers, which can affect their purchase decisions.

Other options, while they may involve localization processes, do not directly address creating a dedicated section for washing instructions on the detail page. For instance, setting the product system object type as localizable pertains to the object itself rather than specifically handling custom attributes meant for washing instructions. Adding resource files or specific attributes for each locale could also lead to unnecessary complexity without effectively achieving the goal of a dedicated section for washing instructions.