Concept:Syllogism uses given statements to check logical validity of conclusions.
Explanation:Statements: No toffee is coffee. No sweet is toffee.
This means toffees are separate from both coffee and sweets, but coffee and sweets have no stated relation.
They could be overlapping, disjoint, or one included in the other.
Conclusion I (No coffee is sweet) is not necessarily true.
Conclusion II (All sweets are coffee) is definitely not true.
Thus neither conclusion follows.
Answer:Neither I nor II follows.