Answer:
D. Horizontal asymptote
Explanation:
We are given,
Graph of the function H(w) with respect to w-axis.
It is required to find the property of w-axis for the function.
Now, 'Asymptotes are the curves which approaches the graph arbitrarily close'.
Thus, as the curve is approaching the w-axis arbitrarily close.
So, w-axis is a horizontal aysmptote for the graph of the function H(w).
Hence, option D is correct.