Observe the graph.
The function is a linear function.
The rate of change of the function is constant.
Hence derivative of the function is a constant function.
Graph is the correct choice.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7638897a5bb9204998d7996637c7b50a.png\")
is a linear function.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=925f59429372b4c2e96d60fd9e38602c.png\")
is the correct choice.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=925f59429372b4c2e96d60fd9e38602c.png\")
is the correct choice.