Answer
We can rank the materials according to freezing point temperature:
$1 \gt 2 \gt 3$
Work Step by Step
When the graph shows a horizontal section, this is the time when the material is freezing, that is, changing from liquid state to solid state.
We can see on the vertical axis of the graph that this horizontal section is highest for material 1 and lowest for material 3.
We can rank the materials according to freezing point temperature:
$1 \gt 2 \gt 3$
