QOD writers have gotten lazy, and QOD approvers have gotten lax with the result being that QOD's are often submitted with nothing but a copy of the correct answer for an explanation. Very un-educating.
I don't presume to know enough about SQL Server to submit my own QOD's, so I can't respond to "if you can do better why don't you?", but please, QOD writers and approvers, put a little time in and submit/require a decent explanation for those of us who are still learning.