The Hue image is (B). The other two are not shown because they are both just a square.
The confusion rises because the term image has a different connotation in photography than for computing. The ones shown the diagram other than (A) are 2D arrays rendered visually as an image.
Figure (A) is an image comprised of 2 green squares, 1 red and 1 blue but each ...
For anyone else wanting to do this I figured it out.
First I got the color curve I wanted, and clicked the plus to "Save the current settings as named preset"
Then next to the plus I pressed Manage presets -> export current settings to file
Then I downloaded CurveBatch from here http://gimpfr.org/contrib_photolabo.php
Then in GIMP I clicked edit->...