Final answer:
To access a section file's settings outside of that section in Shopify, you should pass the setting into a snippet file using a custom variable as direct access is not possible with the Liquid template language.
Step-by-step explanation:
The question is about accessing a section file's settings in Shopify Liquid templates outside of that section. The correct method is c. Passing the section's setting into a snippet file using a custom variable. You cannot directly use section settings outside of their own section with the Liquid template language. Instead, you should pass the specific setting you want to use into a snippet via a custom variable. This approach allows the snippet to access the value of the setting, as snippets are included within your Liquid templates or other sections.