First-party web tracking is difficult to prevent because:

The available tools to block tracking would break most sites' functionality (Option A): Many web applications rely on first-party cookies for essential functions like user authentication, session management, and personalization. Blocking these cookies can render websites unusable.

Option B is incorrect because consumer preference for targeted advertising does not impact the technical difficulty of blocking first-party tracking. Option C is incorrect as regulatory frameworks are increasingly addressing web tracking. Option D is incorrect because most browsers do offer mechanisms to block tracking, although they are more effective against third-party tracking.

IAPP Information Privacy Technologist (CIPT) training materials

''Privacy Engineering: A Data Flow and Ontological Approach'' by IAPP