Tierra's research paper is about why text messaging while driving should be illegal in every state. Which of these sentences is the best thesis?

A.
Text messaging behind the wheel has been shown to cause car accidents that result in more than three times the number of fatalities of regular telephone use.
B.
All drivers who text or email have been shown to take their eyes off the road and cause accidents.
C.
Most drivers are known to take their eyes off the road while driving to concentrate on text messaging or sending emails from their QWERTY keyboard cell phones.
D.
Young drivers are much more likely to text message or send emails while behind the wheel of a car.

A. Text messaging behind the wheel has been shown to cause car accidents that result in more than three times the number of fatalities of regular telephone use.