Answer:
examine the drivers head
Explanation:
Based on the information provided in regards to the situation it can be said that in order to determine if the deformity to the windshield was caused by the driver hitting his head or by the airbags you should examine the drivers head. This is because if the damage to the windshield was caused by the driver's head then the driver would have cuts on his head as well as small shards of glass from the windshield.