ACT Sci nonsensical question???

Here is this question concerning a graph:

http://pbrd.co /1LYQRyI

The question asks the vegetable oil’s absorbance at 1.5A at end of 10 minutes. How in the world is it 40 C???

Post the entire description and question, not just the second study.

The entire trial was for 10 minutes, so it is the last square of the vegetable oil.