The intervals where f is decreasing can be found by looking at the graph for the values of x where x increases and f decreases.
Looking at the graph, the first interval where the function is decreasing is between -3.5 and -1, so we have -3.5 < x < -1.
Then, the second interval where the function is decreasing starts approximately at x = 2.2, and goes towards positive infinity, so we have x > 2.2.
Looking at the options, we have:
-4.5 < x < -4
In this interval the function is increasing.
-0.5 < x < 0
In this interval the function is increasing.
1 < x < 2
In this interval the function is increasing.
Therefore the correct option is D.
