Fill in the blank (_) in the following sentence from the following choices.
Sentence: His temperature was significantly reduced when they added ice to the bath water.  The _ enveloped him.

Choice 1: His temperature was significantly reduced when they added ice to the bath water.  The ice enveloped him.
Choice 2: His temperature was significantly reduced when they added ice to the bath water.  The water enveloped him.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
1.