What is the maximum number of blocks that could be added by a merchant to a section?

The maximum number of blocks that can be added by a merchant to a section in Shopify is essentially unlimited, which is why the answer indicating that there is no limit is correct. Shopify's Online Store 2.0 architecture allows for the creation and customization of sections with blocks in a highly flexible manner. This flexibility enables merchants to tailor their storefronts extensively according to their branding and product display needs.

Each section can be constructed in a way that accommodates multiple blocks, allowing for various content types such as images, text, videos, and custom features. Essentially, the framework is designed to enable extensive customization, letting merchants add as many components as they require to create an engaging and effective online shopping experience.

The mention of numerical limits in the other options (like 10, 25, or 50) does not reflect Shopify's current capabilities, as the platform is continually updated to enhance the merchant experience and allow for maximum creativity and personalization.