Two samples of water of equal mass are heated to 60 degrees Celsius. One sample is poured into an insulated container...

Two samples of water of equal mass are heated to 60 degrees Celsius. One sample is poured into an insulated container, and the other sample is poured into a non-insulated container. The samples are then left for 70 minutes to cool in a room having a temperature of 25 degrees Celsius. The graph above shows the temperature of each sample at 10-minute intervals. Which of the following statements correctly compares the average rates at which the temperatures of the two samples change?