The compulsory training for city wagon drivers resulted in a reduction in fatal accident rate over the past two years. Compared to the five-year period prior to the compulsion of the training fatal accident rate decreased by 25 percent. Which one of the following if true most substantially strengthens the argument above?
[A].
The accident rate of other traffic has remained steady over the past five years.
[B].
Traffic load has increased over the past five years.
[C].
Government has implemented a speed control campaign last year
[D].
Road conditions in the country are better than has been previously.
[E].
Accident rate of woman drivers has decreased.
Answer: Option A
Explanation:
If the compulsory training is the factor responsible for the reduction then the accident rate of other traffic segment must remain same.