Final answer:
A severely injured car crash victim with multiple traumatic injuries and unstable vital signs should be taken to a trauma center, as it is equipped to manage a variety of complex injuries and pre-existing health conditions.
Step-by-step explanation:
The best destination for a patient who has been seriously injured in a car crash, is unresponsive, has a suspected collapsed lung, a severely deformed leg with heavy bleeding, and has diabetes and significant heart problems, assuming all of the facilities are the same distance away, would be C) Trauma center. Trauma centers are equipped to handle the broad and complex nature of the injuries, including the need for emergency surgery, stabilization, and management of multiple injuries. The existing medical conditions such as diabetes and heart problems can also be addressed in a trauma center.