Carla’s boyfriend Al abruptly ended their relationship after a year together. Carla’s friendship with her long-time study partner Greg then unexpectedly blossomed into a romantic relationship. Which statement best describes the impact on Carla of these events according to the Student Stress Scale? a. Whether these events cause or relieve stress depends on Carla’s perceptions of them. b. The negative event followed by a positive event leads to a null effect. c. Carla will be happier in the long run with Greg. d. These changes in Carla’s life require effort to adapt and regain stability, of which stress is a natural by- product. e. Carla is highly likely to become ill in the coming year due to stress