The correct option is headings links task lists and HTML comments.

These features let you structure a README with clear sections, add navigable references, track to do items that readers can check, and include notes that do not render. They are part of the core syntax supported by GitHub Flavored Markdown and are widely used in documentation.

The option import statements method signatures and runtime code blocks is incorrect because these are programming language elements rather than Markdown syntax. Markdown does support code blocks for display, yet the rest of this grouping is unrelated to Markdown features.

The option class declarations variable assignments and function invocations is incorrect because it lists constructs from programming languages instead of formatting primitives for documentation. These are examples of source code and not features of Markdown.

The option jobs steps and runners in GitHub Actions is incorrect because these terms belong to workflow configuration for automation on GitHub. They relate to continuous integration and automation rather than to Markdown formatting for a README.

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