What is the risk factor that influences most accidents?

What is the risk factor that influences most accidents?
A)The road and environment factor.
B)The vehicle factor.
C)The human factor.Correct
The vast majority of traffic accidents are due to human errors. Factors such as distractions, excessive speed, fatigue or alcohol consumption are behind between 70% and 90% of incidents. Vehicle failures or road and environment conditions represent a much smaller percentage.