At first I thought just 3 and 4 because they look like ice cream and melted Starbursts. But then I thought 1 looks like a mixture of milk and white chocolate. And then I realized 2 looks like licorice.
So the answer is you'll find me in the Isle Delfino emergency room after I've sampled all of the island's goo flavours.
4 reminds me of these chewy sweets I remember from my childhood called Fruit Salad.
Edit: I don't know how to spell, apparently.
I'd ask which one meets my dietary requirements and then never be offered any goop again.
Which sounds sad but I'm the only one who bakes and makes sweets so I'm delighted when this happens. And much more delighted than when I eat something and spend 12 hours firing from both ends.
And also I get to meet people who love a challenge and make me something new to enjoy like stuffed squash blossoms which are just... so yummy.
1 looks like a flavor I'm not really in the mood for right now, but I would eat. I'd take 4 right now though.