Which of the following functions best describes this graph?

For this case the function shown in the graph is:
 
 To prove it, it is enough to check two solutions:

 1) intersection with the y axis:
 It happens when we evaluate the function for x = 0.
 We have then:
 
 Therefore, the ordered pair intersection with the y-axis is:
 
 As you can see in the graph.

 2) Cut point with the x axis:
 It occurs when y = 0.
 We have then:
 
 Thus,
  (With multiplicity 2)

 
 
 option A