One of the scoring options you can configure when adding, or editing, a question is its "N/A" scoring.
It is possible to mark any answer option, regardless of the answer text, as "N/A" so that the selection of that option causes the question's points to be removed from scoring. You can mark more than one answer option as "N/A".
Enable "N/A"
To mark an answer option as"N/A", simply check off the box in the column labelled "N/A" next to that answer option.
As expected, this results in the points for this question being ignored when the "N/A" option is selected:
Disable "N/A"
If we disable the "N/A" setting for that answer option, the points will be scored for the "N/A" selection.
Now, when the N/A option is selected, points for it are scored.
Note that you do not have to turn off the "Omit N/A" setting on the Survey Settings page in order for this to work.