D2 and D3 is available for everyone, and since those seat almost sold out before it was possible to buy single tickets there will be a lot of neutrals, Chelsea fans and Shaktar fans on those seats as well (even though the number of Juventus fans will be bigger there than other seats).
I will recommend upper C or D2-D3. Basically because lower C and B is for FC Nordsjælland fans, and because upper C is also for away fans and neutrals. Furthermore, there is a great view from upper C. I'm usually sitting in upper C or upper A when I'm going to games in Parken.

D2-D3 is closer to the Juve away fans at D1 and because there are a lot of non FCN fans there.
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I am tempted to go :lick:
Which section will the Juventus fans be at?
Where do you live?