Based on responses on the blog (thanks for that by the way), I have choose 3 candidates...
Goldie Underline II
(A mix of A and B; the line appears behind the bottom of the text rather than below it)
These are not set in stone. More like plaster. Some things about them can be changed, such as the color and thickness of the gradient line. For instance, this is what Goldie Underline II would be like if the line were 1 pixel thinner (I wouldn't make a "D" for a 1-pixel difference).
I also made a "strikethru" version; it's no good, so it's not a candidate.