Technically they're not petals as they can't be distinguished from sepals. What sort of quiz is this? Is it the sort with trick questions expecting the answer zero or is it a standard quiz? if the latter then I would go with six.
The Numbers Quiz
£1 - Chq payable to Derbyshire Wildlife Trust.
Available from John Bland 39 Montrose Close Sinfin Derby DE24 9LW
Closing date 13th September 2018
It's either a ridiculously easy question (look at a picture and count to six) or it's a tricky question as the answer is technically zero. You have to assess the measure of the quiz GG and make a choice :o)