Statements:
Some pastries are toffees.
All toffees are chocolates.
All chocolates are sandwich.
Conclusions:
I. All toffees are sandwich.
II. Some pastries are sandwich.
III. Some chocolates are toffees.
All toffees are chocolates(A) + All chocolates are sandwich(A) ⇒ All toffees are sandwich(A). Hence conclusion I follow. Some pastries are toffees(I) + All toffees are chocolates(A) ⇒ Some pastries are chocolates(I) + All chocolates are sandwich(A) ⇒ Some pastries are sandwich(I). Hence conclusion II follows. All toffees are chocolates(A) ⇒ Conversion ⇒ Some chocolates are toffees(I). Hence conclusion III follows.