A teacher arrives at school and flips on the light switch upon entering the classroom. The lights do not come on. The custodian’s hypothesis is that a circuit breaker is open. However, the custodian finds that the classroom's breaker is not open. What is the next best step to solve the problem? A Make sure the lights are plugged in. B Check whether other breakers are open. C Notify the school administrators. D Develop a new hypothesis for why the lights don’t turn on.