题目选项分析

Accidents involving drivers who do not wear seatbelts have been shown to cause higher rates of serious injury than accidents involving drivers who do wear seatbelts. Because drivers who do not wear seatbelts can end up costing taxpayers money in medical bills, Thoracic County should make it illegal to drive without a seatbelt.

Which of the following, if true, provides the most support for the argument above?

【选项】Within Thoracic County, the majority of citizens already wear their seatbelts.