Choose the grammatically complete sentence.
กAlthough the deadline was extended.
ขBecause the team finished on the original date.
คAlthough the deadline was extended, the team finished on the original date.
งWhile the original deadline.
เฉลยอธิบาย
although-clause ต้องมี main clause เพื่อให้ประโยคสมบูรณ์