B. Social norms -Speaking out against sexual assault
Explanation:
Wearing a bike helmet is not required by any law or transit law, so that would be a form to prevent injury with an individual behavior, then speking out against sexual assault is related to social norms, since it is a social problematic that we need to face as a society, bring it out of the shadows and help the victims of sexual assault speak up and accuse their abusers.
