Answer:
Choice A
Period = 4
Amplitude=2
Explanation:
From the graph you can see that the graph of the function periodically repeats ecah 4 units. This means that the period of the function is T=4.
The range of the function is [-4,0]. The midpoint of the range is y=-2. When you draw the line =-2, you can see that the graph is 2 units above the line y=-2 and 2 units below the line y=-2. This means that the amplitude is 2.