How can a school most effectively raise awareness of bike-helmet safety? by holding a bike-helmet–awareness event by hosting a talk about bike helmets at a retirement home by expelling students who do not wear bike helmets by encouraging students to walk instead of riding bikes

By holding a bike-helmet-awareness event.

Explanation: By talking at a retirement home about bike helmets, it has no affect, as most people in a retirement home cannot even ride bikes anymore, or already know of these dangers. Expelling students fixes nothing and is an overly extreme punishment, as there is no educational purpose in it at all, and students will most likely continue without helmets, and encouraging students to walk instead of riding bikes does not teach them about the dangers of not using a helmet, and instead just avoids the topic completely.

The best answer would be to hold an awareness event, which would inform students on the safety measures that helmets provide, what injuries can be caused by bike riding without a helmet, and how to use them effectively/how to pick a good helmet. This could prevent many injuries, and maybe even fatalities.

true dat because you don't physically and emotional stress