Question

All Halloween lovers should know what to say when knocking on the door! “Trick or _____”.

Answer 1

All Halloween lovers should know what to say when knocking on the door! “Trick or _Treat_.

This is basically the correct sentence which is discussed here.

So, here the correct sentence is discussed clearly.

The discussed things are basically the answer to the questions..

This clearly indicates that the above is the answer which is discussed.