registration & registry

The hotel requires that guests should present the major credit card for the
< > process.
a. registry
b. registraion
The answer is B
I don't know the difference between a and b.
Thanks a lot.

I think you meant "registration.
You are right, B is correct.

Registration is a process. When you come to the hotel, you must register (Fill out the registration form).That is what the card is needed for.


Registry = written record ( names, numbers, transactions, etc.)