Observe the graph, the graph is in v - shape. The absolute value functions contains only v - shaped graphs. So, the function of given graph is absolute value function.
The function of given graph is A for absolute value.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")