The correct option is The commit count in the repository exceeds 10,000.

GitHub disables some repository graphs when a project has an extremely large history so that performance remains acceptable. When a repository reaches this scale the Code frequency chart can be unavailable or fail to load because generating the underlying data is too resource intensive. This limitation is tied to repository size and activity rather than to a user’s relationship to the project.

The repository is private and you only have read access is not the cause because users with read access can view repository Insights. Privacy status by itself does not disable the Code frequency chart.

You are not watching the repository is not relevant because watching only affects notifications and does not control access to Insights graphs.

The README file is missing does not impact the Code frequency chart because that graph is calculated from commit history and line changes rather than from repository documentation.

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