The high and low temperatures for 6days in Cloud City are plotted on the coordinate plane. The x-axis represents the day number, and the y-axis represents the temperature in degrees Celsius ( °C degree). What was the difference between the high and low temperatures on Day 6? Choose 1 answer: (Choice A) 3 ° C degree (Choice B) 6 ° C degree (Choice C) 9 ° C degree (Choice D) 12 ° C degree