Which one of these statements, if true, most strengthens Anh’s mother’s argument?

Anh’s mother has written a letter to the school. She has suggested that, for the children's safety, cars should be banned from the roads around the school at the beginning and end of the day, as there is a high risk of a child being involved in an accident.

Which one of these statements, if true, most strengthens Anh’s mother’s argument?

Parents who go to work after taking children to school may be late if they have to walk with their children to school. When people cannot find a place to park they can get very bad-tempered. Exhaust fumes from cars are invisible but very harmful to children. People who live close to the school have complained about the noise at the beginning and end of the school day.

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Which one of these statements, if true, most strengthens Anh’s mother’s argument?