Final answer:
To prove financial responsibility after a crash, you provide proof of insurance, which indicates that you meet the legal coverage requirements to cover damages from the accident.
Step-by-step explanation:
If you're in a crash, you must prove financial responsibility for all damage you caused. The most common way to prove financial responsibility is by providing proof of insurance. This demonstrates that you carry at least the minimum amount of insurance coverage required by law, which can cover damages or injuries resulting from an accident you're responsible for. A valid driver's license is a legal requirement to drive but does not prove financial responsibility. While paying with a credit card or cash on the spot may address immediate costs, they do not serve as recognized proof of your ability to take financial responsibility for accidents. Therefore, the correct answer to show financial responsibility after an accident is to provide proof of insurance.