What restrictions are there on the range of the function H (w) below?

A. H (w) 1

B. H (w) < 0

C. H (w) > 0

D. H (w) = 1

The function, named H (w) is defined by a graph that is a descendant line, that belongs only to the first quadrant. As w approaches to 0 by the right, the function approaches to + infinity. It never touches the vetical axis, decreases and approaches to 0 when w approaches to infinity. The graph never touches the horizontal - axis.

Then, the function is defined only for positive values of w and H (w) is always positive.

Then, the answer is H (w) > 0, this is the option C.