Which of these statements BEST identifies the main idea of this document?

A Important research has created a huge database of vehicle related fatalities.

B Important research proves that the most common driving distraction is the use of cell phones.

Important research indicating that driver inattention is the leading factor in most crashes and near$-$crashes is now available.

Important research reveals that drowsiness is a major problem that increases a driver's risk of a crash or near$-$crash by at least a factor of four.