The correct choice is clouds in this case, because those have the closest connotation in literature with change. The elements given have several connotations in literature. For example, darkness implies that something is unknown or it refers to a sense of being lost. Pesonification is a means of adding emotion and differing points of view to a story. The moon and the night that are treated there have similar connotations to darkness; the moon can also be said to wane or be a full moon so it encompasses change. HOWEVER, the most obvious choice is that clouds mean change; they always drift along and they change, appearing and disappearing.
Most likely teachers because they can talk to the principal about it. Also, it would be helpful to talk to parents so they can tell their kids and talk to other people about it.
