The argument is : “The road safety campaigners should turn their attention to finding ways of helping young people to drive safely…”.
1 – Correct
The traps are placed in order to stop accidents. It doesn’t matter whether or not it focuses on the most common cause of accidents.
2 – Wrong
This cannot be correct as the fact that most common cause of accidents is driver under the age of 25 still remains a fact.
3 – Correct
Th last sentence of the text suggest that safe and responsible driving does not include obeying the speed limit.
Since 1 and 3 are correct, E is the answer.