Final answer:
The question is about the understanding of driver training instructors regarding Electronic Stability Control (ESC) in cars.
Step-by-step explanation:
The subject of this question is Cars. The question is asking about the knowledge and understanding of driver training instructors regarding Electronic Stability Control (ESC). ESC is a technology in cars that helps prevent skidding or loss of control during abrupt maneuvers.
The question highlights that a significant proportion of driver training instructors were unable to explain what ESC is, how it works, or the best way to drive with it since 2007. This suggests that there may be a lack of awareness or training among some instructors regarding this safety feature.
Overall, the question is related to cars and the understanding of driver training instructors about the functioning and importance of Electronic Stability Control.