Scientists wanted to study the effect of water temperature on the swimming speed of goldfish. They set up an experiment in which they raised populations of goldfish in two different aquariums. Population 1 was raised a 5°C. Population 2 was raised at 25°C. All other variables were constant in both aquariums. The results of this experiment are shown in the graph below. According to the graph, both populations of goldfish swim at the same speed at which of these temperatures?
A. 12°C
B. 17°C
C. 22°C
D. 27°C