Some of the quiz category quidelines have not been updated recently, so you may see a discrepancy between the guidleines and what the system actually allows you to do. All quizzes, in all categories, now require interesting info for all questions.
A true/false quiz is actually one where the interesting info is most needed, and easist to come upon. because you need to explain why the non correct answer is not correct.
In general, if it is hard for you to think of anything to write, go a little outside the narrow boundaries of your particular question, and just find something interesting about the subject. For instance, one of the categories I edit in is Music. If an author is making a quiz on song lyrics, they will sometimes find it hard to say anything about the song, except maybe which album it came out on. I tell them that they can also write about the artist, the video, the songwriter, the band, the tours the band has taken ... there's lots to talk about! When writing a quiz, you are already on the Internet, so you have access to all kinds of information. All you need to do is look for it.
With your particular quiz, I would write to an editor in the category (if you have already submitted the quiz and been rejected, write to the editor who has already seen your quiz) and discuss the matter in depth. The editor will give you some avenues to explore. We much prefer you to keep working on a quiz until it's good, rather than just deleting. This is because the same problems will just come up in your next quiz. Much better to learn how to make a good quiz, and move on from there.