Which of the following attributes is required to render a block?

To render a block within a Shopify theme, the required attribute is the type. The type attribute specifies the kind of block being created, which is essential for the rendering engine to understand how to process and display the block correctly. Each block can have a unique type that corresponds to its functionality and design, enabling the theme to utilize different styles, settings, and logic based on that type.

The type attribute essentially informs the theme what to expect and how to handle the associated content and styling of the block, making it foundational for the rendering process. Without a properly defined type, the system would not know how to instantiate or display the block, leading to rendering issues.

The other attributes, such as ID, Title, and Settings, enhance the functionality and customization of the block but are not strictly necessary for a block to be rendered. The ID helps in uniquely identifying the block, Title offers a user-friendly label for the block, and Settings allow customization of its content, yet the absence of any of these doesn't prevent the block from rendering as long as its type is correctly defined.