Berta has written a paper in which she claims that travel by road has become safer in recent years. which piece of evidence best supports her claim?

a)over the past 10 years, an increasing number of businesses are encouraging employees to use bicycles instead of cars.
b)over the past 10 years, authorities have steadily increased the number of officials patrolling the streets to prevent reckless driving.
c)statistics show that the number of deaths per year due to road accidents decreased by 14.97 percent over the past 10 years.
d)authorities have set up kiosks across the nation to inform citizens about road safety measures to prevent accidents.