The insurance company is most likely to pay for "an office visit to a specialist for an x-ray" as preventative care typically includes services that help identify or prevent health issues before they become more serious. However, the most common preventative care services covered usually include vaccinations, annual physical exams, screenings, and other proactive measures.
The other options, such as treatment after a car accident or an online visit when sick, would generally be classified as non-preventative care and might not be fully covered under the preventative care clause.
It's worth noting that the specific policies can vary based on the insurance plan, so it's always best to check the details of the plan for exact coverage.