Anil poured equal amounts of water into four containers as shown in the figure and kept all of them out in the hot sun for an entire day. At the end of the day, he measured the amount of water left in each container. What was Anil testing for?

• A.  Whether evaporation depends on the volume of water taken
• B.  Whether evaporation depends on temperature
• C. manufacturing
• D.  Whether evaporation depends on the exposed area of water