In Up for Debate: Should Drivers Be Banned from Using

In Up for Debate: Should Drivers Be Banned From Using Cell Phones While Operating a Vehicle?:

A) studies have found that there is no evidence that people are impaired in their driving while using a cell phone.
B) several states have banned the use of cell phones by drivers in general and some are specifically targeting groups like school bus drivers.
C) while there might be issues from texting while using a cell phone, there is no evidence to suggest that talking on the phone has a negative impact.
D) all of the above.