Fill in the blank (_) in the following sentence from the following choices.
Sentence: Mary decided to grow hydroponic lettuce on her farm and hired Carrie to design the system. _ paid for the plans to build the hydroponics system.

Choice 1: Mary decided to grow hydroponic lettuce on her farm and hired Carrie to design the system. Mary paid for the plans to build the hydroponics system.
Choice 2: Mary decided to grow hydroponic lettuce on her farm and hired Carrie to design the system. Carrie paid for the plans to build the hydroponics system.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.