题目内容：
A man and his wife had a small bar near a station．The bar often stayed open until after midnight，because people came to drink there while they were waiting for trains． At two o'clock one morning，one man was still sitting at a table in the small bar．He was a—sleep．The barman’s wife wanted to go to bed．She looked into the bar several times，and eachtime the man was still there．Then at last she went to her husband and said to him，“You’vewaken that man six times now，George，but he isn’t drinking anything．Why haven’t you senthim away?It is very late．”
“0h，no，I don’t want to send him away，”answered her husband with a smile：”Yousee，whenever I wake him up，he asks for his bill，and when I bring it to him．He pays it．Then he goes to sleep again．”
根据以上内容，回答题。
The bar often stayed open__________． A．until 12 o'clock in the evening
B．until early next morning
C．all day and all night
D．until after 12 o'clock in the evening
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答案解析：