Explanation: The red titled line in the graph passing through the origin has the equation y = x. If you shade y < x from that line, you would get the lower half of the whole graph.
The straight red line in the graph has the equation y = 4. If you shade y < 4 and y < x, you would get the shaded area of the graph given in the question. Hence the correct answer is Option (B) y < x, y < 4.