Which of the following statements is CORRECT about smoking restriction according to the pa

Which of the following statements is CORRECT about smoking restriction according to the passage？

A．Municipal bans on smoking in restaurants and bars are effective.

B．Scribbler50 himself did some research on the effectiveness of the bans on smoking.

C．Christian Jarrett found the morbid signs on cigarettes are important.

D．The measure that parents are restricted from smoking in cars with children is useful.

请帮忙给出正确答案和分析，谢谢！