The answer is A, there is no clauses in A, making it a simple sentence.
Hope this helps!
Answer: Hope This Helps!
Explanation:
During the last task, they both decided to win the tournament together by grabbing a Cup, which transported them to the ceremony Voldemort was enacting in order to return to power.
Can you explain the question a little more what do you mean by approach like googling the word or breaking the word up?
It's a complete sentence and has to be connected to another one