Answer:
B. Studies showing that accidents have increased
Explanation:
With respect to the highway code, the use of cell phones while driving is prohibited. Though some drivers disobeys this rule of the code which causes division of concentration or distraction of the driver on the conditions and signals on the road. The distraction of the driver may cause the occurrence of an accident.
The banning of the use of cell phones by some states could be because accident rate has increased due to that.