It is such a pity that a quiz for such a worthwhile charity is spoiled by such sloppy proof-reading. The setter must have left out a vital word - eg largest, brightest, closest, first discovered etc.
Or perhaps she meant Mars, which only has 2. !!
I agree but I did ask about the 8 continents and she said her book says there are 8 so guess she has a book that say uranus has 2 satellites. Unfortunately I think she feels that as it is for such a good cause we shouldnt mind but as I said the last quiz had unclear questions and this one is the same.