£50 Morrisons voucher.

Great start to the weekend, I've just won £50 from Morrisons in their #potatoWin competition on 30 July. As a newbie to this (this may have been the first one I did!), I just wonder if they pick rondomlyfrom the correct answers or if they base it on additional comments/humour to the answer? This is what I put:
Question:
FACT: Over five and a half million tonnes of potatoes are grown on British farms each year. For your chance to win a £50 Morrisons voucher tell us how many football pitches these potatoes would fill using #PotatoWin. Is it a) 50,000 b) 100,000 or c) 120,000 Comp T&Cs apply
Answer:
My guess would be c) 120,000. Would make for an interesting match with a pitch full of potatoes. Fingers crossed that with a new manager and new signings, #LUFC don't play like potatoes this season.

I'll look up who ever posted the original notice later and thank them too.

Morrisons Hi Tony, you're our competition winner!!! Please PM me your full address and contact number. Thanks, Smaira