Read the sentence and answer the question.
When he was on that stage, Mark had the attention of everybody in a room.
The sentence has an error with article usage. Which sentence corrects that error?
1 When he was on that stage, the Mark had the attention of everybody in the room.
2 When he were on that stage, Mark had the attention of everybody in a room.
3 When he was on that stage, Mark had the attention of everybody in an room.
4 When he was on that stage, Mark had the attention of everybody in the room.
5 When he was on that stage, Mark had the attention of everybody in a room.