Carla made a plan to spend more time with her friends but found that her plan didn't seem to be working well.Which of the following is the most likely reason that Carla's plan is not working as she expected? A)Carla made a plan before monitoring and evaluating her schedule. B)Carla is not adequately motivated to change her behavior. C)Carla is more committed to her activities than to her friends. D)Carla has an external locus of control.