Why should you not discuss the cause of the collision with other parties involved?

The choice indicating that only trained professionals should determine causes is correct because discussions about the cause of a collision can lead to misunderstandings or misinterpretations by those involved. Trained professionals, such as law enforcement officers and accident investigators, utilize their expertise to analyze the situation accurately, including examining evidence, witness statements, and understanding the law. They can provide an objective assessment of what occurred without the emotional biases or uncertainties that parties directly involved might feel. Discussing the cause prematurely can also result in complications for legal proceedings or insurance claims, as only a thorough investigation can yield a valid conclusion about fault or responsibility.