The correct answer is: The most common driving violations are related to accident risk factors for teen drivers.
In this case you have two different groups of information: 1) Greatest accident risk factors and 2) Most common driving violations. So the best fit for an essay would be an statement that summarizes all the information shown before. The option "The most common driving violations are related to accident risk factors for teen drivers" mentions the most common driving violation (speeding, not using turn signals, following too closely, passing) and the accident risk factors for teen drivers (poor hazard detection, low-risk perception, lack of skill, risk-taking). Thus, is the correct one.
On the opposite hand, the other statements don't have all these elements. First, the option: "Teen drivers are not focused on the road, which leads to the most common driving violations", doesn't mention the risk factor. Second, the statement "The greatest accident risk factors for teen drivers show that teens are not responsible on the road" is missing the most common accident part. And third, the choice "Driving violations show that teen drivers are not concerned with the safety of others on the road" misses both parts, the risk factor and the most common driving situations.