Fill in the blank (_) in the following sentence from the following choices.
Sentence: Ian is making a pool party for Neil and needs to raise pH in a pool, so _ buys pH raising preparates.

Choice 1: Ian is making a pool party for Neil and needs to raise pH in a pool, so Ian buys pH raising preparates.
Choice 2: Ian is making a pool party for Neil and needs to raise pH in a pool, so Neil buys pH raising preparates.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.