Fill in the blank (_) in the following sentence from the following choices.
Sentence: The man drank more coffee than he did water because he got a headache when he only had _ .

Choice 1: The man drank more coffee than he did water because he got a headache when he only had coffee .
Choice 2: The man drank more coffee than he did water because he got a headache when he only had water .
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
1.