A marketer is reviewing their company's website performance on mobile devices. They notice that while the content and layout are identical to the desktop version, the user engagement is significantly lower and the bounce rate is higher. According to Google's mobile-first indexing, which of the following is the MOST likely cause of this issue?
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A
The website uses responsive design, which is outdated for mobile optimization.
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B
The website is missing a dedicated mobile URL (e.g., m.website.com).
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C
The mobile version has poor performance metrics, such as slow page load speed and layout shifts.
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D
The desktop version of the site has more backlinks than the mobile version.