A group of frogs (called an army) is living in a tree. A frog turns green when in the shade and yellow when in the sun. Initially the ratio of green to yellow frogs was 3:1. Then 3 green frogs moved to the sunny side and 5 yellow frogs moved to the shady side. Now the ratio is 4:1. What is the difference between the number of green frogs and yellow frogs now?<spanclass=′latex−bold′>(A)</span>10<spanclass=′latex−bold′>(B)</span>12<spanclass=′latex−bold′>(C)</span>16<spanclass=′latex−bold′>(D)</span>20<spanclass=′latex−bold′>(E)</span>24