So, this is sort of outside the scope of the GMAT, but let's dig in anyways.
We know conclusion 1 is necessarily true. There are more than one toffees in existence (because some pastries are toffees, and some implies more than 1). At bare minimum, there are two. Given that all the toffees in the world are chocolates, then there are at least two chocolates which are toffees as well.
These statements aren't great, because a real logician would demand to know more about the object categories "toffee", "pastry", and "chocolate". It's unclear whether these are descriptions of items, object categories, or fundamental attributes of an item (the sine qua non of an object). So I don't love this, but this is what they were going for.
Conclusion 2 is not necessarily true, but it may be true. From statement 1, it's possible that toffee is a subset of pastries (so all toffees are pastries, but not all pastries are toffees), or it's possible that toffee and pastry are intersecting sets (some toffees are pastries, some toffees are not pastries). It's even possible that toffee and pastry are synonymous, if we assume that "some pastries are toffees" leaves open the statement that "all pastries are toffees".
Again, these statements aren't great, because the answer choice should state "necessarily follows". Over all, despite how fun this is, I'd recommend you stick with actual,
OG Critical Reasoning questions. This stuff will just distract you.