Answer
C) A number line with an open circle on −2, a closed circle on 5, and shading in between
Step-by-step explanation
Remember that the symbols: < and > (read "less than" and "greater than" respectively) translates into an open circle in the number line.
The symbols: ≤ and ≥ (read "less or equal than" and "Greater or equal than" respectively) translates into a closed circle in the number line.
Now, let's solve each inequality:

So we have an open circle on -2
3x less than or equal to 15


So we have a closed circle on 5
Our inequalities goes from -2 (open circle) to 5 (closed circle) on the number line.