【单选题】

Questions 11--13 are based on the following passage. You now have 15 seconds to read Questions 11--13. What is the most fundamental difference between plants and animalsA．Plants produce their own food but animals don’t.

B．Plant cells have a wall which is non-living in chemical nature but animal cells haven’t.
C．Plants are green but animals aren’t.
D．Plants can’t move but animals can.