You are given the graph of the function and then asked to solve the inequality when is . In other words, you are asked to find all values of where is a point on or below the -axis. So, where is that true? Let's look at the possibilities.
Looking at the graph makes it easy to rule out any answers that contradict the graph. For example, (b) is obviously wrong because -1 is a real number that is not equal to -2 nor 2, but is clearly above the -axis.
Among (a), (c), and (d), obviously one answer is correct and the rest are not. So, for the two that are not correct, tell me a point in the given intervals where the function is above the x-axis, or tell me a point that is not in the given intervals where the function is on or below the x-axis.