Preschool Teachers Often Believe That They Can Reduce Children's Aggression

Preschool teachers often believe that they can reduce children's aggression by attempting to "engineer" the environment of their classroom.In general,are these attempts effective?

A) yes, they are an effective way of reducing the incidence of aggressive acts
B) no, they have little effect on the incidence of aggressive acts
C) no, they backfire and result in an increase in aggressive acts
D) partially, as they are ineffective at controlling aggressive acts but are effective in reducing the actual harm caused by aggressive acts