Final answer:
Shopify does not publicly specify which version of Sass it uses down to the version number. Developers should check Shopify's official documentation for the current supported versions of technologies.
Step-by-step explanation:
The version of Sass that Shopify currently compiles and runs is not publicly detailed by Shopify to a version level as specific as the options provided (i.e., 2.0, 3.2, 3.8, or 4.0). Shopify uses a Sass-compatible syntax for themes, but developers should typically refer to the official Shopify documentation or forums for the most up-to-date information on supported technology versions since this can change with updates to their platform.