Excerpt from Preventing Backovers in America's Driveways
National Highway Transportation Safety Administration

All Vehicles Have Blind Spots

5 In the case of a backover incident, the blind spot is the place behind your vehicle that you cannot see in the rear or side view mirrors — or even by craning your neck out the driver’s side window. Generally speaking, the larger the vehicle, the larger the blind spot.

The author would like to add a sentence in section 5 of this passage. Choose the MOST effective location for this sentence: Therefore drivers of large vehicles need to be especially aware of their environment.
A) after sentence 1
B) after sentence 2
C) before sentence 1
D) at the end of section 4