Answer:
D. Quadrant IV
Step-by-step explanation:
At first we need to graph the function [tex]y = 3\cdot x[/tex], whose representation is included in the figure attached below. The positive slope and the y-intercept equal to zero means that the inequality only takes any point below the line into account, that is, it covers Quadrants I and III partially and the Quadrant IV completely. Then, the correct answer is D.