While exercising, Carly burns 450 calories per hour biking and 620 calories per hour playing racquetball. Sarah burns 560 calories per hour running and 510 calories per hour playing squash. In a workout consisting of 30 minutes of each respective exercise, who burns more calories? Select one: A. Carly burns more calories. B. Sarah burns more calories. C. Both girls burn the same amount of calories. D. This cannot be determined from the information given.