Task: Question Answering
Input (English): Background Paragraph: Shown in the Figure below is a cylinder of gas on the left that is at room temperature (300 K). On the right, the cylinder has been heated until the Kelvin temperature has doubled to 600 K. The kinetic energy of the gas molecules increases, so collisions with the walls of the container are now more forceful than they were before. As a result, the pressure of the gas doubles. Decreasing the temperature would have the opposite effect, and the pressure of an enclosed gas would decrease. 
Story: David was trying to see how steam engines work. For that, he conducted two tests, test A and test B. In test A, he used low temperature. On the other hand, in test B, he used high temperature. David started thinking about how he could use the results of his tests in everyday life. 
Question: Which test would see decrease in pressure, case A or case B?
Output (English): case A.