A、In September of 2019. B、In October of 2019. C、In October of 2018. D、In September of 2018. A

Well, if you’ve been close to an electric or hybrid car passing by, you might have noticed that it is quieter than a typical gasoline powered car. Too quiet as far as the U.S. government is concerned. So, the National Highway Traffic Safety Administration has a new rule for electric or hybrid cars sold in the US. They’ve got to make more noise. (3)The rule takes effect in September of 2019, and that time, all manufacturers have to make sure that new battery powered cars have sound alerts when they’re traveling at 19 miles per hour or slower. This can help pedestrian, especially people who are blind or have limited vision, know when there’s a car nearby and alert them to possible danger. Hearing as well as seeing the cars could increase safety. (4)It says the alerts could help prevent 2,400 pedestrian injuries every year.
Questions 3 and 4 are based on the news report you have just heard.
3.When does the rule take effect?
4.How many pedestrians could be protected from injuries by the alerts every year?