See you and thanks for coming?

[Torsten]

Hi,

I've just come across this English test question: You have invited your best friends to a party. One of them has to leave. He says: 'Thanks for the invitation. See you.' What would you answer.

a) Good-bye and thank you for coming.
b) See you and thanks for coming.

I would say that 'b' is probably the most appropriate response but what exactly is wrong with 'a'?

See you and thanks for sharing your thoughts.

Torsten

TOEIC listening, talks: Sales agent is leaving voice message for customer regarding new time for appointment

[Yankee]

There's a difference in register. Option (a) sounds more formal -- too formal for the context.
.
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