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