To display a variant image on the cart page instead of a product's default image, which filter would you use?

To display a variant image on the cart page instead of a product's default image, the most appropriate filter to use is the variant_img_url filter. This filter is specifically designed to retrieve the image URL for a specific variant of a product. When a product has multiple variants, each variant can have its own image, and using this filter allows the theme to access and display the correct image associated with the selected variant.

Using this filter is essential because it directly points to the variant's image rather than the default product image, ensuring that customers see the right visual representation of the item they are purchasing. This functionality enhances the shopping experience by providing clarity on the specific options a customer has selected.

The other filters, while useful in different contexts, do not focus on variant-specific images. For example, the product_img_url filter retrieves the default image for a product, which may not accurately reflect the selected variant. The img_url filter is more generic and can be applied to any image but does not specifically target variant images. The file_img_url filter is used for accessing files uploaded to the Shopify admin and is not relevant to product or variant images at all. Therefore, the variant_img_url filter is the best choice for ensuring that each variant's unique image is displayed