Answer:
It is the first one because the second one has a circle which is not filled so that represents n ≤ 3. It is also not the third one because you can see that every number after 3 is red which means that it represents n > -3 as the solution lies after -3. In the third one, the circle is also not filled and all number after the -3 is the solution which means that it represents n ≥ 3