Answer:
The second number line
Explanation:
The salesperson says that it should be no more than 12 psi, which is the equivalent to x ≤ 12
By process of elimination, you can remove the bottom two number lines because they exceed 12 psi, leaving the top two.
The only difference between those two are points at 12 - the first line is has an open dot, and the second one has a closed dot.
The difference between these dots is whether the term is included or not. An open dot means that the point is NOT included in the answer (everything up to 12, not including 12), and a closed dot means the dot is included in the answer (everything up to 12, including 12).
This means that our answer is the second number line, because 12 is included.