How would you ask if you are looking for the check-in counter for the flight CA112 to Seoul?
A.
How to check in for the flight CA 112 to Seoul?
B.
Could you tell me where I check in for the flight CA 112 to Seoul?
C.
When to check in for the flight CA 112 to Seoul?
D.
Where to check in for the flight CA 121 to Seoul?