A student investigates the cooling of two different metal containers, X and Y, filled with hot water. The temperature of each container is recorded over time.
Which of these temperatures is most likely to be the room temperature of the laboratory, as shown by the graph?
85 ∘C85\ ^\circ\text{C}85 ∘C
50 ∘C50\ ^\circ\text{C}50 ∘C
20 ∘C20\ ^\circ\text{C}20 ∘C
0 ∘C0\ ^\circ\text{C}0 ∘C